252131520121 has 16 divisors (see below), whose sum is σ = 280919136960. Its totient is φ = 224687453760.

The previous prime is 252131520107. The next prime is 252131520143. The reversal of 252131520121 is 121025131252.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 252131520121 - 2¹⁵ = 252131487353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252131524121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4166346 + ... + 4226428.

It is an arithmetic number, because the mean of its divisors is an integer number (17557446060).

Almost surely, 2^252131520121 is an apocalyptic number.

It is an amenable number.

252131520121 is a deficient number, since it is larger than the sum of its proper divisors (28787616839).

252131520121 is a wasteful number, since it uses less digits than its factorization.

252131520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71256.

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

Adding to 252131520121 its reverse (121025131252), we get a palindrome (373156651373).

The spelling of 252131520121 in words is "two hundred fifty-two billion, one hundred thirty-one million, five hundred twenty thousand, one hundred twenty-one".