21095064400 has 30 divisors (see below), whose sum is σ = 50680893182. Its totient is φ = 8438025600.

The previous prime is 21095064383. The next prime is 21095064413. The reversal of 21095064400 is 446059012.

It can be written as a sum of positive squares in 3 ways, for example, as 1639278144 + 19455786256 = 40488^2 + 139484^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26368431 + ... + 26369230.

Almost surely, 2^21095064400 is an apocalyptic number.

21095064400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21095064400 is an abundant number, since it is smaller than the sum of its proper divisors (29585828782).

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

21095064400 is a wasteful number, since it uses less digits than its factorization.

21095064400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52737679 (or 52737668 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21095064400 in words is "twenty-one billion, ninety-five million, sixty-four thousand, four hundred".