21431722252 has 24 divisors (see below), whose sum is σ = 37973638080. Its totient is φ = 10582408320.

The previous prime is 21431722241. The next prime is 21431722331. The reversal of 21431722252 is 25222713412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255613 + ... + 328939.

It is an arithmetic number, because the mean of its divisors is an integer number (1582234920).

Almost surely, 2^21431722252 is an apocalyptic number.

It is an amenable number.

21431722252 is a deficient number, since it is larger than the sum of its proper divisors (16541915828).

21431722252 is a wasteful number, since it uses less digits than its factorization.

21431722252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74241 (or 74239 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The spelling of 21431722252 in words is "twenty-one billion, four hundred thirty-one million, seven hundred twenty-two thousand, two hundred fifty-two".