252030621 has 4 divisors (see below), whose sum is σ = 336040832. Its totient is φ = 168020412.

The previous prime is 252030613. The next prime is 252030637. The reversal of 252030621 is 126030252.

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 252030621 - 2³ = 252030613 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 (252030601) 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, 42005101 + ... + 42005106.

It is an arithmetic number, because the mean of its divisors is an integer number (84010208).

Almost surely, 2^252030621 is an apocalyptic number.

It is an amenable number.

252030621 is a deficient number, since it is larger than the sum of its proper divisors (84010211).

252030621 is an equidigital number, since it uses as much as digits as its factorization.

252030621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84010210.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 252030621 is about 15875.4723079347. The cubic root of 252030621 is about 631.6615424923.

Adding to 252030621 its reverse (126030252), we get a palindrome (378060873).

The spelling of 252030621 in words is "two hundred fifty-two million, thirty thousand, six hundred twenty-one".