21365560272004 has 12 divisors (see below), whose sum is σ = 40265863589644. Its totient is φ = 9861027817824.

The previous prime is 21365560271917. The next prime is 21365560272011. The reversal of 21365560272004 is 40027206556312.

It can be written as a sum of positive squares in 2 ways, for example, as 1075580558404 + 20289979713600 = 1037102^2 + 4504440^2 .

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, 205438079487 + ... + 205438079590.

Almost surely, 2^{21365560272004} is an apocalyptic number.

It is an amenable number.

21365560272004 is a deficient number, since it is larger than the sum of its proper divisors (18900303317640).

21365560272004 is a wasteful number, since it uses less digits than its factorization.

21365560272004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410876159094 (or 410876159092 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 21365560272004 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty million, two hundred seventy-two thousand, four".