157100321 has 12 divisors (see below), whose sum is σ = 186200532. Its totient is φ = 132114528.

The previous prime is 157100299. The next prime is 157100347. The reversal of 157100321 is 123001751.

It can be written as a sum of positive squares in 2 ways, for example, as 129390625 + 27709696 = 11375^2 + 5264^2 .

It is not a de Polignac number, because 157100321 - 2¹⁰ = 157099297 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 157100293 and 157100302.

It is not an unprimeable number, because it can be changed into a prime (157100381) 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, 27650 + ... + 32843.

It is an arithmetic number, because the mean of its divisors is an integer number (15516711).

Almost surely, 2^157100321 is an apocalyptic number.

It is an amenable number.

157100321 is a deficient number, since it is larger than the sum of its proper divisors (29100211).

157100321 is an equidigital number, since it uses as much as digits as its factorization.

157100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60560 (or 60553 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 157100321 is about 12533.9666905573. The cubic root of 157100321 is about 539.5839513669.

The spelling of 157100321 in words is "one hundred fifty-seven million, one hundred thousand, three hundred twenty-one".