19821631504 has 20 divisors (see below), whose sum is σ = 39055335120. Its totient is φ = 9742835360.

The previous prime is 19821631499. The next prime is 19821631517. The reversal of 19821631504 is 40513612891.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10497802 + ... + 10499689.

It is an arithmetic number, because the mean of its divisors is an integer number (1952766756).

Almost surely, 2^19821631504 is an apocalyptic number.

It is an amenable number.

19821631504 is a deficient number, since it is larger than the sum of its proper divisors (19233703616).

19821631504 is a wasteful number, since it uses less digits than its factorization.

19821631504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20997558 (or 20997552 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 19821631504 in words is "nineteen billion, eight hundred twenty-one million, six hundred thirty-one thousand, five hundred four".