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21031222220201 = 96893217056157
BaseRepresentation
bin1001100100000101101101…
…00001111001010110101001
32202110120021001000001102202
410302002312201321112221
510224033420342021301
6112421335441105545
74300312202201654
oct462026641712651
982416231001382
1021031222220201
11677932272a0a6
122437ba99282b5
13b9730ac1898b
14529cb918489b
1526710c6a066b
hex1320b68795a9

21031222220201 has 4 divisors (see below), whose sum is σ = 21031439373252. Its totient is φ = 21031005067152.

The previous prime is 21031222220171. The next prime is 21031222220213. The reversal of 21031222220201 is 10202222213012.

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 14472706098601 + 6558516121600 = 3804301^2 + 2560960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21031222220201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031221220201) 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, 108431186 + ... + 108624971.

It is an arithmetic number, because the mean of its divisors is an integer number (5257859843313).

Almost surely, 221031222220201 is an apocalyptic number.

It is an amenable number.

21031222220201 is a deficient number, since it is larger than the sum of its proper divisors (217153051).

21031222220201 is an equidigital number, since it uses as much as digits as its factorization.

21031222220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217153050.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21031222220201 its reverse (10202222213012), we get a palindrome (31233444433213).

The spelling of 21031222220201 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred one".

Divisors: 1 96893 217056157 21031222220201