21102110977252 has 12 divisors (see below), whose sum is σ = 36928847131120. Its totient is φ = 10551011796936.

The previous prime is 21102110977247. The next prime is 21102110977253. The reversal of 21102110977252 is 25277901120112.

It is a super-2 number, since 2×21102110977252² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102110977253) 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, 9823938 + ... + 11777689.

Almost surely, 2^{21102110977252} is an apocalyptic number.

It is an amenable number.

21102110977252 is a deficient number, since it is larger than the sum of its proper divisors (15826736153868).

21102110977252 is a wasteful number, since it uses less digits than its factorization.

21102110977252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21845850 (or 21845848 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 40.

The spelling of 21102110977252 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, nine hundred seventy-seven thousand, two hundred fifty-two".