21102500522 has 4 divisors (see below), whose sum is σ = 31653750786. Its totient is φ = 10551250260.

The previous prime is 21102500521. The next prime is 21102500527. The reversal of 21102500522 is 22500520112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13036844041 + 8065656481 = 114179^2 + 89809^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102500494 and 21102500503.

It is not an unprimeable number, because it can be changed into a prime (21102500521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275625129 + ... + 5275625132.

Almost surely, 2^21102500522 is an apocalyptic number.

21102500522 is a deficient number, since it is larger than the sum of its proper divisors (10551250264).

21102500522 is a wasteful number, since it uses less digits than its factorization.

21102500522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551250263.

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 21102500522 in words is "twenty-one billion, one hundred two million, five hundred thousand, five hundred twenty-two".