221625311873406 has 32 divisors (see below), whose sum is σ = 506680918368000. Its totient is φ = 63307920560256.

The previous prime is 221625311873351. The next prime is 221625311873429. The reversal of 221625311873406 is 604378113526122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566348656 + ... + 566739843.

It is an arithmetic number, because the mean of its divisors is an integer number (15833778699000).

Almost surely, 2^{221625311873406} is an apocalyptic number.

221625311873406 is an abundant number, since it is smaller than the sum of its proper divisors (285055606494594).

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

221625311873406 is a wasteful number, since it uses less digits than its factorization.

221625311873406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133093168.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 221625311873406 in words is "two hundred twenty-one trillion, six hundred twenty-five billion, three hundred eleven million, eight hundred seventy-three thousand, four hundred six".