221022988 has 6 divisors (see below), whose sum is σ = 386790236. Its totient is φ = 110511492.

The previous prime is 221022983. The next prime is 221023003. The reversal of 221022988 is 889220122.

It is a happy number.

It is a super-2 number, since 2×221022988² = 97702322448896288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221022983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627870 + ... + 27627877.

Almost surely, 2^221022988 is an apocalyptic number.

It is an amenable number.

221022988 is a deficient number, since it is larger than the sum of its proper divisors (165767248).

221022988 is a wasteful number, since it uses less digits than its factorization.

221022988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55255751 (or 55255749 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 221022988 is about 14866.8418973230. The cubic root of 221022988 is about 604.6153217932.

The spelling of 221022988 in words is "two hundred twenty-one million, twenty-two thousand, nine hundred eighty-eight".