21199718512 has 40 divisors (see below), whose sum is σ = 46950244992. Its totient is φ = 9084043200.

The previous prime is 21199718467. The next prime is 21199718513. The reversal of 21199718512 is 21581799112.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199718513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849087 + ... + 873697.

Almost surely, 2^21199718512 is an apocalyptic number.

It is an amenable number.

21199718512 is an abundant number, since it is smaller than the sum of its proper divisors (25750526480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21199718512 is a wasteful number, since it uses less digits than its factorization.

21199718512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32317 (or 32311 counting only the distinct ones).

The product of its digits is 90720, while the sum is 46.

The spelling of 21199718512 in words is "twenty-one billion, one hundred ninety-nine million, seven hundred eighteen thousand, five hundred twelve".