21610928400 has 60 divisors (see below), whose sum is σ = 69227011152. Its totient is φ = 5762913920.

The previous prime is 21610928387. The next prime is 21610928407. The reversal of 21610928400 is 482901612.

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 (21610928407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9003354 + ... + 9005753.

Almost surely, 2^21610928400 is an apocalyptic number.

21610928400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21610928400 is an abundant number, since it is smaller than the sum of its proper divisors (47616082752).

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

21610928400 is a wasteful number, since it uses less digits than its factorization.

21610928400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18009128 (or 18009117 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The spelling of 21610928400 in words is "twenty-one billion, six hundred ten million, nine hundred twenty-eight thousand, four hundred".