221607966 has 16 divisors (see below), whose sum is σ = 458499600. Its totient is φ = 71322048.

The previous prime is 221607943. The next prime is 221607977. The reversal of 221607966 is 669706122.

It is a super-2 number, since 2×221607966² = 98220181189314312, which contains 22 as substring.

It is a congruent number.

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, 636631 + ... + 636978.

It is an arithmetic number, because the mean of its divisors is an integer number (28656225).

Almost surely, 2^221607966 is an apocalyptic number.

221607966 is an abundant number, since it is smaller than the sum of its proper divisors (236891634).

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

221607966 is a wasteful number, since it uses less digits than its factorization.

221607966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273643.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 221607966 is about 14886.5028129511. The cubic root of 221607966 is about 605.1482604566.

The spelling of 221607966 in words is "two hundred twenty-one million, six hundred seven thousand, nine hundred sixty-six".