157221275 has 12 divisors (see below), whose sum is σ = 195278424. Its totient is φ = 125568000.

The previous prime is 157221263. The next prime is 157221277. The reversal of 157221275 is 572122751.

157221275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-157221275 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157221277) 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, 11120 + ... + 20930.

It is an arithmetic number, because the mean of its divisors is an integer number (16273202).

Almost surely, 2^157221275 is an apocalyptic number.

157221275 is a deficient number, since it is larger than the sum of its proper divisors (38057149).

157221275 is an equidigital number, since it uses as much as digits as its factorization.

157221275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462 (or 10457 counting only the distinct ones).

The product of its digits is 9800, while the sum is 32.

The square root of 157221275 is about 12538.7908109195. The cubic root of 157221275 is about 539.7223938910.

The spelling of 157221275 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, two hundred seventy-five".