252519021891 has 24 divisors (see below), whose sum is σ = 384446677680. Its totient is φ = 159474159936.

The previous prime is 252519021889. The next prime is 252519021901. The reversal of 252519021891 is 198120915252.

It is a happy number.

252519021891 is a `hidden beast` number, since 2 + 52 + 519 + 0 + 2 + 1 + 89 + 1 = 666.

It is not a de Polignac number, because 252519021891 - 2¹ = 252519021889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252519021871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9113581 + ... + 9141246.

It is an arithmetic number, because the mean of its divisors is an integer number (16018611570).

Almost surely, 2^252519021891 is an apocalyptic number.

252519021891 is a deficient number, since it is larger than the sum of its proper divisors (131927655789).

252519021891 is a wasteful number, since it uses less digits than its factorization.

252519021891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18254915 (or 18254912 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The spelling of 252519021891 in words is "two hundred fifty-two billion, five hundred nineteen million, twenty-one thousand, eight hundred ninety-one".