252523421 has 4 divisors (see below), whose sum is σ = 255720000. Its totient is φ = 249326844.

The previous prime is 252523399. The next prime is 252523501. The reversal of 252523421 is 124325252.

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 252523421 - 2¹⁸ = 252261277 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 (252523721) 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, 1598171 + ... + 1598328.

It is an arithmetic number, because the mean of its divisors is an integer number (63930000).

Almost surely, 2^252523421 is an apocalyptic number.

It is an amenable number.

252523421 is a deficient number, since it is larger than the sum of its proper divisors (3196579).

252523421 is an equidigital number, since it uses as much as digits as its factorization.

252523421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196578.

The product of its digits is 4800, while the sum is 26.

The square root of 252523421 is about 15890.9855263920. The cubic root of 252523421 is about 632.0729741686.

Adding to 252523421 its reverse (124325252), we get a palindrome (376848673).

The spelling of 252523421 in words is "two hundred fifty-two million, five hundred twenty-three thousand, four hundred twenty-one".