252921 has 4 divisors (see below), whose sum is σ = 337232. Its totient is φ = 168612.

The previous prime is 252919. The next prime is 252937. The reversal of 252921 is 129252.

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 not a de Polignac number, because 252921 - 2¹ = 252919 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 252921.

It is not an unprimeable number, because it can be changed into a prime (252911) 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, 42151 + ... + 42156.

It is an arithmetic number, because the mean of its divisors is an integer number (84308).

2²⁵²⁹²¹ is an apocalyptic number.

It is an amenable number.

252921 is a deficient number, since it is larger than the sum of its proper divisors (84311).

252921 is an equidigital number, since it uses as much as digits as its factorization.

252921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84310.

The product of its digits is 360, while the sum is 21.

The square root of 252921 is about 502.9125172433. The cubic root of 252921 is about 63.2404517241.

The spelling of 252921 in words is "two hundred fifty-two thousand, nine hundred twenty-one".