21356374522 has 12 divisors (see below), whose sum is σ = 37264694490. Its totient is φ = 9152731896.

The previous prime is 21356374519. The next prime is 21356374591. The reversal of 21356374522 is 22547365312.

It can be written as a sum of positive squares in only one way, i.e., 14541706921 + 6814667601 = 120589^2 + 82551^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108960997 + ... + 108961192.

Almost surely, 2^21356374522 is an apocalyptic number.

21356374522 is a deficient number, since it is larger than the sum of its proper divisors (15908319968).

21356374522 is a wasteful number, since it uses less digits than its factorization.

21356374522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217922205 (or 217922198 counting only the distinct ones).

The product of its digits is 302400, while the sum is 40.

The spelling of 21356374522 in words is "twenty-one billion, three hundred fifty-six million, three hundred seventy-four thousand, five hundred twenty-two".