21513053522 has 4 divisors (see below), whose sum is σ = 32269580286. Its totient is φ = 10756526760.

The previous prime is 21513053501. The next prime is 21513053533. The reversal of 21513053522 is 22535031512.

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., 21374732401 + 138321121 = 146201^2 + 11761^2 .

It is a super-2 number, since 2×21513053522² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378263379 + ... + 5378263382.

Almost surely, 2^21513053522 is an apocalyptic number.

21513053522 is a deficient number, since it is larger than the sum of its proper divisors (10756526764).

21513053522 is a wasteful number, since it uses less digits than its factorization.

21513053522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756526763.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21513053522 in words is "twenty-one billion, five hundred thirteen million, fifty-three thousand, five hundred twenty-two".