118157221 has 16 divisors (see below), whose sum is σ = 146006784. Its totient is φ = 93112704.

The previous prime is 118157197. The next prime is 118157227. The reversal of 118157221 is 122751811.

It is a cyclic number.

It is not a de Polignac number, because 118157221 - 2⁵ = 118157189 is a prime.

It is a super-2 number, since 2×118157221² = 27922257748885682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 118157221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118157227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21465 + ... + 26401.

It is an arithmetic number, because the mean of its divisors is an integer number (9125424).

Almost surely, 2^118157221 is an apocalyptic number.

It is an amenable number.

118157221 is a deficient number, since it is larger than the sum of its proper divisors (27849563).

118157221 is a wasteful number, since it uses less digits than its factorization.

118157221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its digits is 1120, while the sum is 28.

The square root of 118157221 is about 10870.0147653994. The cubic root of 118157221 is about 490.7045549710.

The spelling of 118157221 in words is "one hundred eighteen million, one hundred fifty-seven thousand, two hundred twenty-one".