221360031 has 12 divisors (see below), whose sum is σ = 321706008. Its totient is φ = 146667024.

The previous prime is 221359997. The next prime is 221360039. The reversal of 221360031 is 130063122.

221360031 is a `hidden beast` number, since 22 + 13 + 600 + 31 = 666.

It is not a de Polignac number, because 221360031 - 2⁷ = 221359903 is a prime.

It is a super-2 number, since 2×221360031² = 98000526648641922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221359986 and 221360013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221360039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73980 + ... + 76913.

It is an arithmetic number, because the mean of its divisors is an integer number (26808834).

Almost surely, 2^221360031 is an apocalyptic number.

221360031 is a deficient number, since it is larger than the sum of its proper divisors (100345977).

221360031 is a wasteful number, since it uses less digits than its factorization.

221360031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151062 (or 151059 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 221360031 is about 14878.1729725125. The cubic root of 221360031 is about 604.9224962758.

The spelling of 221360031 in words is "two hundred twenty-one million, three hundred sixty thousand, thirty-one".