21594712372 has 6 divisors (see below), whose sum is σ = 37790746658. Its totient is φ = 10797356184.

The previous prime is 21594712361. The next prime is 21594712429. The reversal of 21594712372 is 27321749512.

It can be written as a sum of positive squares in only one way, i.e., 21422420496 + 172291876 = 146364^2 + 13126^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2699339043 + ... + 2699339050.

Almost surely, 2^21594712372 is an apocalyptic number.

It is an amenable number.

21594712372 is a deficient number, since it is larger than the sum of its proper divisors (16196034286).

21594712372 is a wasteful number, since it uses less digits than its factorization.

21594712372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5398678097 (or 5398678095 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The spelling of 21594712372 in words is "twenty-one billion, five hundred ninety-four million, seven hundred twelve thousand, three hundred seventy-two".