21102110977237 has 2 divisors, whose sum is σ = 21102110977238. Its totient is φ = 21102110977236.

The previous prime is 21102110977229. The next prime is 21102110977247. The reversal of 21102110977237 is 73277901120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10902768140356 + 10199342836881 = 3301934^2 + 3193641^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102110977237 - 2³ = 21102110977229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102110977193 and 21102110977202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102110977247) 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 as a sum of consecutive naturals, namely, 10551055488618 + 10551055488619.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055488619).

Almost surely, 2^{21102110977237} is an apocalyptic number.

It is an amenable number.

21102110977237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102110977237 is an equidigital number, since it uses as much as digits as its factorization.

21102110977237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 43.

The spelling of 21102110977237 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, nine hundred seventy-seven thousand, two hundred thirty-seven".