21298972636562 has 8 divisors (see below), whose sum is σ = 31948825107276. Its totient is φ = 10649364267472.

The previous prime is 21298972636549. The next prime is 21298972636573. The reversal of 21298972636562 is 26563627989212.

It is a Cunningham number, because it is equal to 4615081²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 21298972636561 + 1 = 4615081^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21298972636492 and 21298972636501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60807113 + ... + 61156380.

Almost surely, 2^{21298972636562} is an apocalyptic number.

21298972636562 is a deficient number, since it is larger than the sum of its proper divisors (10649852470714).

21298972636562 is a wasteful number, since it uses less digits than its factorization.

21298972636562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122050812.

The product of its digits is 235146240, while the sum is 68.

The spelling of 21298972636562 in words is "twenty-one trillion, two hundred ninety-eight billion, nine hundred seventy-two million, six hundred thirty-six thousand, five hundred sixty-two".