21012316645200 has 60 divisors (see below), whose sum is σ = 67309454323968. Its totient is φ = 5603284438400.

The previous prime is 21012316645181. The next prime is 21012316645237. The reversal of 21012316645200 is 254661321012.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8755130736 + ... + 8755133135.

Almost surely, 2^{21012316645200} is an apocalyptic number.

21012316645200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012316645200 is an abundant number, since it is smaller than the sum of its proper divisors (46297137678768).

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

21012316645200 is a wasteful number, since it uses less digits than its factorization.

21012316645200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17510263892 (or 17510263881 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 21012316645200 its reverse (254661321012), we get a palindrome (21266977966212).

The spelling of 21012316645200 in words is "twenty-one trillion, twelve billion, three hundred sixteen million, six hundred forty-five thousand, two hundred".