221664424226 has 128 divisors (see below), whose sum is σ = 428805964800. Its totient is φ = 83715489792.

The previous prime is 221664424213. The next prime is 221664424229. The reversal of 221664424226 is 622424466122.

It is not an unprimeable number, because it can be changed into a prime (221664424229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54743450 + ... + 54747498.

It is an arithmetic number, because the mean of its divisors is an integer number (3350046600).

Almost surely, 2^221664424226 is an apocalyptic number.

221664424226 is a deficient number, since it is larger than the sum of its proper divisors (207141540574).

221664424226 is a wasteful number, since it uses less digits than its factorization.

221664424226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308.

The product of its digits is 442368, while the sum is 41.

The spelling of 221664424226 in words is "two hundred twenty-one billion, six hundred sixty-four million, four hundred twenty-four thousand, two hundred twenty-six".