21012936189930 has 48 divisors (see below), whose sum is σ = 54633885906600. Its totient is φ = 5603423823744.

The previous prime is 21012936189929. The next prime is 21012936189937. The reversal of 21012936189930 is 3998163921012.

21012936189930 is a `hidden beast` number, since 2 + 1 + 0 + 12 + 9 + 3 + 618 + 9 + 9 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17965331533809 + 3047604656121 = 4238553^2 + 1745739^2 .

It is not an unprimeable number, because it can be changed into a prime (21012936189937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26734024 + ... + 27508796.

Almost surely, 2^{21012936189930} is an apocalyptic number.

21012936189930 is an abundant number, since it is smaller than the sum of its proper divisors (33620949716670).

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

21012936189930 is a wasteful number, since it uses less digits than its factorization.

21012936189930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076135 (or 1076132 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 21012936189930 in words is "twenty-one trillion, twelve billion, nine hundred thirty-six million, one hundred eighty-nine thousand, nine hundred thirty".