221063664 has 20 divisors (see below), whose sum is σ = 571081256. Its totient is φ = 73687872.

The previous prime is 221063653. The next prime is 221063669. The reversal of 221063664 is 466360122.

221063664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221063664² = 97738287082209792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221063669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302699 + ... + 2302794.

Almost surely, 2^221063664 is an apocalyptic number.

221063664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221063664 is an abundant number, since it is smaller than the sum of its proper divisors (350017592).

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

221063664 is a wasteful number, since it uses less digits than its factorization.

221063664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605504 (or 4605498 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 221063664 is about 14868.2098451697. The cubic root of 221063664 is about 604.6524096764.

The spelling of 221063664 in words is "two hundred twenty-one million, sixty-three thousand, six hundred sixty-four".