21692387192 has 64 divisors (see below), whose sum is σ = 49249969920. Its totient is φ = 8744191488.

The previous prime is 21692387177. The next prime is 21692387201. The reversal of 21692387192 is 29178329612.

It is a self number, because there is not a number n which added to its sum of digits gives 21692387192.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656623 + ... + 1669665.

It is an arithmetic number, because the mean of its divisors is an integer number (769530780).

Almost surely, 2^21692387192 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 21692387192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24624984960).

21692387192 is an abundant number, since it is smaller than the sum of its proper divisors (27557582728).

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

21692387192 is a wasteful number, since it uses less digits than its factorization.

21692387192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14820 (or 14816 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The spelling of 21692387192 in words is "twenty-one billion, six hundred ninety-two million, three hundred eighty-seven thousand, one hundred ninety-two".