21111874752 has 112 divisors (see below), whose sum is σ = 56526858752. Its totient is φ = 6953610240.

The previous prime is 21111874747. The next prime is 21111874793. The reversal of 21111874752 is 25747811112.

It is a super-3 number, since 3×21111874752³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21111874752.

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, 5662713 + ... + 5666439.

It is an arithmetic number, because the mean of its divisors is an integer number (504704096).

Almost surely, 2^21111874752 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 21111874752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28263429376).

21111874752 is an abundant number, since it is smaller than the sum of its proper divisors (35414984000).

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

21111874752 is a wasteful number, since it uses less digits than its factorization.

21111874752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086 (or 4076 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The spelling of 21111874752 in words is "twenty-one billion, one hundred eleven million, eight hundred seventy-four thousand, seven hundred fifty-two".