21107312400 has 60 divisors (see below), whose sum is σ = 67613761232. Its totient is φ = 5628616320.

The previous prime is 21107312383. The next prime is 21107312407. The reversal of 21107312400 is 421370112.

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

It is not an unprimeable number, because it can be changed into a prime (21107312407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8793514 + ... + 8795913.

Almost surely, 2^21107312400 is an apocalyptic number.

21107312400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21107312400 is an abundant number, since it is smaller than the sum of its proper divisors (46506448832).

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

21107312400 is a wasteful number, since it uses less digits than its factorization.

21107312400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17589448 (or 17589437 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

Adding to 21107312400 its reverse (421370112), we get a palindrome (21528682512).

The spelling of 21107312400 in words is "twenty-one billion, one hundred seven million, three hundred twelve thousand, four hundred".