21722018372 has 12 divisors (see below), whose sum is σ = 38051897856. Its totient is φ = 10850047560.

The previous prime is 21722018291. The next prime is 21722018399. The reversal of 21722018372 is 27381022712.

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 3 ways as a sum of consecutive naturals, for example, 2735948 + ... + 2743875.

It is an arithmetic number, because the mean of its divisors is an integer number (3170991488).

Almost surely, 2^21722018372 is an apocalyptic number.

It is an amenable number.

21722018372 is a deficient number, since it is larger than the sum of its proper divisors (16329879484).

21722018372 is a wasteful number, since it uses less digits than its factorization.

21722018372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480818 (or 5480816 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 21722018372 in words is "twenty-one billion, seven hundred twenty-two million, eighteen thousand, three hundred seventy-two".