21100311251356 has 12 divisors (see below), whose sum is σ = 36933235942960. Its totient is φ = 10547958124800.

The previous prime is 21100311251351. The next prime is 21100311251363. The reversal of 21100311251356 is 65315211300112.

It is a super-2 number, since 2×21100311251356² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100311251351) 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, 549353616 + ... + 549392023.

Almost surely, 2^{21100311251356} is an apocalyptic number.

It is an amenable number.

21100311251356 is a deficient number, since it is larger than the sum of its proper divisors (15832924691604).

21100311251356 is a wasteful number, since it uses less digits than its factorization.

21100311251356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098750444 (or 1098750442 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 21100311251356 its reverse (65315211300112), we get a palindrome (86415522551468).

The spelling of 21100311251356 in words is "twenty-one trillion, one hundred billion, three hundred eleven million, two hundred fifty-one thousand, three hundred fifty-six".