21204579574498 has 16 divisors (see below), whose sum is σ = 32436540626040. Its totient is φ = 10392764077696.

The previous prime is 21204579574489. The next prime is 21204579574523. The reversal of 21204579574498 is 89447597540212.

It can be written as a sum of positive squares in 4 ways, for example, as 19133389433929 + 2071190140569 = 4374173^2 + 1439163^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91061113 + ... + 91293676.

Almost surely, 2^{21204579574498} is an apocalyptic number.

21204579574498 is a deficient number, since it is larger than the sum of its proper divisors (11231961051542).

21204579574498 is a wasteful number, since it uses less digits than its factorization.

21204579574498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182355941.

The product of its (nonzero) digits is 203212800, while the sum is 67.

The spelling of 21204579574498 in words is "twenty-one trillion, two hundred four billion, five hundred seventy-nine million, five hundred seventy-four thousand, four hundred ninety-eight".