21189806070912 has 128 divisors (see below), whose sum is σ = 64229611507200. Its totient is φ = 6872369495040.

The previous prime is 21189806070857. The next prime is 21189806070943. The reversal of 21189806070912 is 21907060898112.

It is a happy number.

21189806070912 is a `hidden beast` number, since 2 + 1 + 18 + 9 + 8 + 0 + 607 + 0 + 9 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82727664 + ... + 82983407.

It is an arithmetic number, because the mean of its divisors is an integer number (501793839900).

Almost surely, 2^{21189806070912} is an apocalyptic number.

It is an amenable number.

21189806070912 is an abundant number, since it is smaller than the sum of its proper divisors (43039805436288).

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

21189806070912 is a wasteful number, since it uses less digits than its factorization.

21189806070912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165711131 (or 165711113 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 21189806070912 in words is "twenty-one trillion, one hundred eighty-nine billion, eight hundred six million, seventy thousand, nine hundred twelve".