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21011122231 = 111910102021
BaseRepresentation
bin10011100100010111…
…000100100000110111
32000020022010121012021
4103210113010200313
5321012321402411
613352525134011
71342450410061
oct234427044067
960208117167
1021011122231
118a0225a130
1240a46ba307
131c9b00a408
1410346ca731
1582e8e7a71
hex4e45c4837

21011122231 has 4 divisors (see below), whose sum is σ = 22921224264. Its totient is φ = 19101020200.

The previous prime is 21011122211. The next prime is 21011122243. The reversal of 21011122231 is 13222111012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011122231 - 211 = 21011120183 is a prime.

It is a super-2 number, since 2×210111222312 (a number of 21 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 (21011122211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955051000 + ... + 955051021.

It is an arithmetic number, because the mean of its divisors is an integer number (5730306066).

Almost surely, 221011122231 is an apocalyptic number.

21011122231 is a deficient number, since it is larger than the sum of its proper divisors (1910102033).

21011122231 is a wasteful number, since it uses less digits than its factorization.

21011122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910102032.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21011122231 its reverse (13222111012), we get a palindrome (34233233243).

The spelling of 21011122231 in words is "twenty-one billion, eleven million, one hundred twenty-two thousand, two hundred thirty-one".

Divisors: 1 11 1910102021 21011122231