21636011456 has 28 divisors (see below), whose sum is σ = 42975653952. Its totient is φ = 10807500288.

The previous prime is 21636011447. The next prime is 21636011461. The reversal of 21636011456 is 65411063612.

It is a congruent number.

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, 97520 + ... + 229743.

It is an arithmetic number, because the mean of its divisors is an integer number (1534844784).

Almost surely, 2^21636011456 is an apocalyptic number.

It is an amenable number.

21636011456 is a deficient number, since it is larger than the sum of its proper divisors (21339642496).

21636011456 is a wasteful number, since it uses less digits than its factorization.

21636011456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328308 (or 328298 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21636011456 in words is "twenty-one billion, six hundred thirty-six million, eleven thousand, four hundred fifty-six".