21712425252 has 24 divisors (see below), whose sum is σ = 57899800896. Its totient is φ = 6203550048.

The previous prime is 21712425239. The next prime is 21712425277. The reversal of 21712425252 is 25252421712.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 129240543 + ... + 129240710.

It is an arithmetic number, because the mean of its divisors is an integer number (2412491704).

Almost surely, 2^21712425252 is an apocalyptic number.

It is an amenable number.

21712425252 is an abundant number, since it is smaller than the sum of its proper divisors (36187375644).

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

21712425252 is a wasteful number, since it uses less digits than its factorization.

21712425252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258481267 (or 258481265 counting only the distinct ones).

The product of its digits is 22400, while the sum is 33.

Adding to 21712425252 its reverse (25252421712), we get a palindrome (46964846964).

The spelling of 21712425252 in words is "twenty-one billion, seven hundred twelve million, four hundred twenty-five thousand, two hundred fifty-two".