21626534544544 has 24 divisors (see below), whose sum is σ = 42583799720448. Its totient is φ = 10811601282240.

The previous prime is 21626534544539. The next prime is 21626534544547. The reversal of 21626534544544 is 44544543562612.

It is not an unprimeable number, because it can be changed into a prime (21626534544547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51851232 + ... + 52266655.

It is an arithmetic number, because the mean of its divisors is an integer number (1774324988352).

Almost surely, 2^{21626534544544} is an apocalyptic number.

It is an amenable number.

21626534544544 is a deficient number, since it is larger than the sum of its proper divisors (20957265175904).

21626534544544 is a wasteful number, since it uses less digits than its factorization.

21626534544544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104124388 (or 104124380 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 55.

The spelling of 21626534544544 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred thirty-four million, five hundred forty-four thousand, five hundred forty-four".