252204521 has 4 divisors (see below), whose sum is σ = 253751952. Its totient is φ = 250657092.

The previous prime is 252204509. The next prime is 252204523. The reversal of 252204521 is 125402252.

252204521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-252204521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (252204523) 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, 773471 + ... + 773796.

It is an arithmetic number, because the mean of its divisors is an integer number (63437988).

Almost surely, 2^252204521 is an apocalyptic number.

It is an amenable number.

252204521 is a deficient number, since it is larger than the sum of its proper divisors (1547431).

252204521 is a wasteful number, since it uses less digits than its factorization.

252204521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547430.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 252204521 is about 15880.9483658880. The cubic root of 252204521 is about 631.8067903027.

Adding to 252204521 its reverse (125402252), we get a palindrome (377606773).

The spelling of 252204521 in words is "two hundred fifty-two million, two hundred four thousand, five hundred twenty-one".