252121615 has 4 divisors (see below), whose sum is σ = 302545944. Its totient is φ = 201697288.

The previous prime is 252121613. The next prime is 252121619. The reversal of 252121615 is 516121252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 252121615 - 2¹ = 252121613 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 252121615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252121613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25212157 + ... + 25212166.

It is an arithmetic number, because the mean of its divisors is an integer number (75636486).

Almost surely, 2^252121615 is an apocalyptic number.

252121615 is a deficient number, since it is larger than the sum of its proper divisors (50424329).

252121615 is an equidigital number, since it uses as much as digits as its factorization.

252121615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50424328.

The product of its digits is 1200, while the sum is 25.

The square root of 252121615 is about 15878.3379167972. The cubic root of 252121615 is about 631.7375524288.

Adding to 252121615 its reverse (516121252), we get a palindrome (768242867).

The spelling of 252121615 in words is "two hundred fifty-two million, one hundred twenty-one thousand, six hundred fifteen".