21000111994008 has 128 divisors (see below), whose sum is σ = 66982980672000. Its totient is φ = 5971595736960.

The previous prime is 21000111994003. The next prime is 21000111994009. The reversal of 21000111994008 is 80049911100012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000111994003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32593203 + ... + 33231266.

It is an arithmetic number, because the mean of its divisors is an integer number (523304536500).

Almost surely, 2^{21000111994008} is an apocalyptic number.

21000111994008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21000111994008 is an abundant number, since it is smaller than the sum of its proper divisors (45982868677992).

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

21000111994008 is a wasteful number, since it uses less digits than its factorization.

21000111994008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65824702 (or 65824692 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 21000111994008 in words is "twenty-one trillion, one hundred eleven million, nine hundred ninety-four thousand, eight".