221515230252 has 24 divisors (see below), whose sum is σ = 525629361600. Its totient is φ = 72586911376.

The previous prime is 221515230247. The next prime is 221515230263. The reversal of 221515230252 is 252032515122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156436602 + ... + 156438017.

It is an arithmetic number, because the mean of its divisors is an integer number (21901223400).

Almost surely, 2^221515230252 is an apocalyptic number.

It is an amenable number.

221515230252 is an abundant number, since it is smaller than the sum of its proper divisors (304114131348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221515230252 is a wasteful number, since it uses less digits than its factorization.

221515230252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312874685 (or 312874683 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 221515230252 its reverse (252032515122), we get a palindrome (473547745374).

The spelling of 221515230252 in words is "two hundred twenty-one billion, five hundred fifteen million, two hundred thirty thousand, two hundred fifty-two".