21102110977253 has 2 divisors, whose sum is σ = 21102110977254. Its totient is φ = 21102110977252.

The previous prime is 21102110977247. The next prime is 21102110977267. The reversal of 21102110977253 is 35277901120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13670936840929 + 7431174136324 = 3697423^2 + 2726018^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102110977253 - 2⁴ = 21102110977237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102110977253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102110974253) 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, 10551055488626 + 10551055488627.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055488627).

Almost surely, 2^{21102110977253} is an apocalyptic number.

It is an amenable number.

21102110977253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102110977253 is an equidigital number, since it uses as much as digits as its factorization.

21102110977253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The spelling of 21102110977253 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, nine hundred seventy-seven thousand, two hundred fifty-three".