21111139376 has 80 divisors (see below), whose sum is σ = 45125683200. Its totient is φ = 9523921920.

The previous prime is 21111139363. The next prime is 21111139397. The reversal of 21111139376 is 67393111112.

It is a happy 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, 890525 + ... + 913923.

It is an arithmetic number, because the mean of its divisors is an integer number (564071040).

Almost surely, 2^21111139376 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 21111139376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22562841600).

21111139376 is an abundant number, since it is smaller than the sum of its proper divisors (24014543824).

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

21111139376 is a wasteful number, since it uses less digits than its factorization.

21111139376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23562 (or 23556 counting only the distinct ones).

The product of its digits is 6804, while the sum is 35.

The spelling of 21111139376 in words is "twenty-one billion, one hundred eleven million, one hundred thirty-nine thousand, three hundred seventy-six".