21722517352 has 8 divisors (see below), whose sum is σ = 40729720050. Its totient is φ = 10861258672.

The previous prime is 21722517319. The next prime is 21722517361. The reversal of 21722517352 is 25371522712.

It can be written as a sum of positive squares in only one way, i.e., 14171950116 + 7550567236 = 119046^2 + 86894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1357657327 + ... + 1357657342.

Almost surely, 2^21722517352 is an apocalyptic number.

It is an amenable number.

21722517352 is a deficient number, since it is larger than the sum of its proper divisors (19007202698).

21722517352 is a wasteful number, since it uses less digits than its factorization.

21722517352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715314675 (or 2715314671 counting only the distinct ones).

The product of its digits is 58800, while the sum is 37.

The spelling of 21722517352 in words is "twenty-one billion, seven hundred twenty-two million, five hundred seventeen thousand, three hundred fifty-two".