157165021 has 8 divisors (see below), whose sum is σ = 169545600. Its totient is φ = 144826032.

The previous prime is 157164977. The next prime is 157165031. The reversal of 157165021 is 120561751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157165021 - 2⁹ = 157164509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157165031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2305 + ... + 17878.

It is an arithmetic number, because the mean of its divisors is an integer number (21193200).

Almost surely, 2^157165021 is an apocalyptic number.

It is an amenable number.

157165021 is a deficient number, since it is larger than the sum of its proper divisors (12380579).

157165021 is a wasteful number, since it uses less digits than its factorization.

157165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20795.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 157165021 is about 12536.5474114686. The cubic root of 157165021 is about 539.6580150606.

The spelling of 157165021 in words is "one hundred fifty-seven million, one hundred sixty-five thousand, twenty-one".