52157321 has 4 divisors (see below), whose sum is σ = 52210944. Its totient is φ = 52103700.

The previous prime is 52157291. The next prime is 52157327. The reversal of 52157321 is 12375125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52157321 - 2¹⁴ = 52140937 is a prime.

It is a super-2 number, since 2×52157321² = 5440772267794082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52157327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25325 + ... + 27306.

It is an arithmetic number, because the mean of its divisors is an integer number (13052736).

Almost surely, 2^52157321 is an apocalyptic number.

It is an amenable number.

52157321 is a deficient number, since it is larger than the sum of its proper divisors (53623).

52157321 is an equidigital number, since it uses as much as digits as its factorization.

52157321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53622.

The product of its digits is 2100, while the sum is 26.

The square root of 52157321 is about 7222.0025616168. The cubic root of 52157321 is about 373.6271485062.

The spelling of 52157321 in words is "fifty-two million, one hundred fifty-seven thousand, three hundred twenty-one".