21000011100984 has 48 divisors (see below), whose sum is σ = 56876325363000. Its totient is φ = 6999844279104.

The previous prime is 21000011100947. The next prime is 21000011100997. The reversal of 21000011100984 is 48900111000012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116559 + ... + 6481790.

Almost surely, 2^{21000011100984} is an apocalyptic number.

21000011100984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21000011100984 is an abundant number, since it is smaller than the sum of its proper divisors (35876314262016).

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

21000011100984 is a wasteful number, since it uses less digits than its factorization.

21000011100984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6642564 (or 6642557 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

Adding to 21000011100984 its reverse (48900111000012), we get a palindrome (69900122100996).

The spelling of 21000011100984 in words is "twenty-one trillion, eleven million, one hundred thousand, nine hundred eighty-four".