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21100223210221 = 181116575818841
BaseRepresentation
bin1001100110000110001110…
…10011110010001011101101
32202201011100211112112020201
410303003013103302023231
510231201224120211341
6112513150403513501
74305304126013041
oct463030723621355
982634324475221
1021100223210221
1167a5610a14191
122449446088891
13ba09863b195c
1452d38322a021
15268cea228331
hex1330c74f22ed

21100223210221 has 4 divisors (see below), whose sum is σ = 21216799029244. Its totient is φ = 20983647391200.

The previous prime is 21100223210173. The next prime is 21100223210267. The reversal of 21100223210221 is 12201232200112.

Adding to 21100223210221 its reverse (12201232200112), we get a palindrome (33301455410333).

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4745923248196 + 16354299962025 = 2178514^2 + 4044045^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100223210221 - 229 = 21099686339309 is a prime.

It is a super-2 number, since 2×211002232102212 (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100223210821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58287909240 + ... + 58287909601.

It is an arithmetic number, because the mean of its divisors is an integer number (5304199757311).

Almost surely, 221100223210221 is an apocalyptic number.

It is an amenable number.

21100223210221 is a deficient number, since it is larger than the sum of its proper divisors (116575819023).

21100223210221 is a wasteful number, since it uses less digits than its factorization.

21100223210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116575819022.

The product of its (nonzero) digits is 192, while the sum is 19.

The spelling of 21100223210221 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred ten thousand, two hundred twenty-one".

Divisors: 1 181 116575818841 21100223210221