21879691328 has 112 divisors (see below), whose sum is σ = 48634302528. Its totient is φ = 9679872000.

The previous prime is 21879691303. The next prime is 21879691343. The reversal of 21879691328 is 82319697812.

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, 19944476 + ... + 19945572.

It is an arithmetic number, because the mean of its divisors is an integer number (434234844).

Almost surely, 2^21879691328 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 21879691328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24317151264).

21879691328 is an abundant number, since it is smaller than the sum of its proper divisors (26754611200).

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

21879691328 is a wasteful number, since it uses less digits than its factorization.

21879691328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852 (or 1842 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 56.

The spelling of 21879691328 in words is "twenty-one billion, eight hundred seventy-nine million, six hundred ninety-one thousand, three hundred twenty-eight".