157221274 has 32 divisors (see below), whose sum is σ = 279806976. Its totient is φ = 64834560.

The previous prime is 157221263. The next prime is 157221277. The reversal of 157221274 is 472122751.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (157221277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82824 + ... + 84700.

It is an arithmetic number, because the mean of its divisors is an integer number (8743968).

Almost surely, 2^157221274 is an apocalyptic number.

157221274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

157221274 is a deficient number, since it is larger than the sum of its proper divisors (122585702).

157221274 is a wasteful number, since it uses less digits than its factorization.

157221274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110.

The product of its digits is 7840, while the sum is 31.

The square root of 157221274 is about 12538.7907710433. The cubic root of 157221274 is about 539.7223927467.

The spelling of 157221274 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, two hundred seventy-four".