19312721572 has 6 divisors (see below), whose sum is σ = 33797262758. Its totient is φ = 9656360784.

The previous prime is 19312721563. The next prime is 19312721579. The reversal of 19312721572 is 27512721391.

It can be written as a sum of positive squares in only one way, i.e., 10062898596 + 9249822976 = 100314^2 + 96176^2 .

It is not an unprimeable number, because it can be changed into a prime (19312721579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2414090193 + ... + 2414090200.

Almost surely, 2^19312721572 is an apocalyptic number.

It is an amenable number.

19312721572 is a deficient number, since it is larger than the sum of its proper divisors (14484541186).

19312721572 is a wasteful number, since it uses less digits than its factorization.

19312721572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4828180397 (or 4828180395 counting only the distinct ones).

The product of its digits is 52920, while the sum is 40.

The spelling of 19312721572 in words is "nineteen billion, three hundred twelve million, seven hundred twenty-one thousand, five hundred seventy-two".