21112000199988 has 24 divisors (see below), whose sum is σ = 49721720100192. Its totient is φ = 6971563928544.

The previous prime is 21112000199957. The next prime is 21112000199989. The reversal of 21112000199988 is 88999100021112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112000199988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112000199989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8221182595 + ... + 8221185162.

It is an arithmetic number, because the mean of its divisors is an integer number (2071738337508).

Almost surely, 2^{21112000199988} is an apocalyptic number.

It is an amenable number.

21112000199988 is an abundant number, since it is smaller than the sum of its proper divisors (28609719900204).

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

21112000199988 is a wasteful number, since it uses less digits than its factorization.

21112000199988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16442367871 (or 16442367869 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 51.

The spelling of 21112000199988 in words is "twenty-one trillion, one hundred twelve billion, one hundred ninety-nine thousand, nine hundred eighty-eight".