21206026173324 has 12 divisors (see below), whose sum is σ = 49480727737784. Its totient is φ = 7068675391104.

The previous prime is 21206026173317. The next prime is 21206026173347. The reversal of 21206026173324 is 42337162060212.

It is a tau number, because it is divible by the number of its divisors (12).

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, 883584423877 + ... + 883584423900.

Almost surely, 2^{21206026173324} is an apocalyptic number.

It is an amenable number.

21206026173324 is an abundant number, since it is smaller than the sum of its proper divisors (28274701564460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21206026173324 is a wasteful number, since it uses less digits than its factorization.

21206026173324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767168847784 (or 1767168847782 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 21206026173324 in words is "twenty-one trillion, two hundred six billion, twenty-six million, one hundred seventy-three thousand, three hundred twenty-four".