21673626402 has 16 divisors (see below), whose sum is σ = 43352958240. Its totient is φ = 7223591232.

The previous prime is 21673626397. The next prime is 21673626421. The reversal of 21673626402 is 20462637612.

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, 187527 + ... + 280202.

It is an arithmetic number, because the mean of its divisors is an integer number (2709559890).

Almost surely, 2^21673626402 is an apocalyptic number.

21673626402 is an abundant number, since it is smaller than the sum of its proper divisors (21679331838).

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

21673626402 is a wasteful number, since it uses less digits than its factorization.

21673626402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475457.

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

The spelling of 21673626402 in words is "twenty-one billion, six hundred seventy-three million, six hundred twenty-six thousand, four hundred two".