21815116992 has 336 divisors, whose sum is σ = 69380831520. Its totient is φ = 6772211712.

The previous prime is 21815116951. The next prime is 21815116997. The reversal of 21815116992 is 29961151812.

It is not an unprimeable number, because it can be changed into a prime (21815116997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28817478 + ... + 28818234.

It is an arithmetic number, because the mean of its divisors is an integer number (206490570).

Almost surely, 2^21815116992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21815116992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34690415760).

21815116992 is an abundant number, since it is smaller than the sum of its proper divisors (47565714528).

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

21815116992 is a wasteful number, since it uses less digits than its factorization.

21815116992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 888 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The spelling of 21815116992 in words is "twenty-one billion, eight hundred fifteen million, one hundred sixteen thousand, nine hundred ninety-two".