252221515 has 24 divisors (see below), whose sum is σ = 374567328. Its totient is φ = 159644160.

The previous prime is 252221507. The next prime is 252221527. The reversal of 252221515 is 515122252.

It is not a de Polignac number, because 252221515 - 2³ = 252221507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252221515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15406 + ... + 27235.

It is an arithmetic number, because the mean of its divisors is an integer number (15606972).

Almost surely, 2^252221515 is an apocalyptic number.

252221515 is a deficient number, since it is larger than the sum of its proper divisors (122345813).

252221515 is a wasteful number, since it uses less digits than its factorization.

252221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42679 (or 42666 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 252221515 is about 15881.4834004888. The cubic root of 252221515 is about 631.8209807481.

Adding to 252221515 its reverse (515122252), we get a palindrome (767343767).

The spelling of 252221515 in words is "two hundred fifty-two million, two hundred twenty-one thousand, five hundred fifteen".