21000112019979 has 8 divisors (see below), whose sum is σ = 28070678705040. Its totient is φ = 13964810007456.

The previous prime is 21000112019933. The next prime is 21000112019993. The reversal of 21000112019979 is 97991021100012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21000112019979 - 2¹⁷ = 21000111888907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000112019979.

It is not an unprimeable number, because it can be changed into a prime (21000112019279) 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, 8816166744 + ... + 8816169125.

It is an arithmetic number, because the mean of its divisors is an integer number (3508834838130).

Almost surely, 2^{21000112019979} is an apocalyptic number.

21000112019979 is a deficient number, since it is larger than the sum of its proper divisors (7070566685061).

21000112019979 is a wasteful number, since it uses less digits than its factorization.

21000112019979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632336269.

The product of its (nonzero) digits is 20412, while the sum is 42.

The spelling of 21000112019979 in words is "twenty-one trillion, one hundred twelve million, nineteen thousand, nine hundred seventy-nine".