21194400 has 72 divisors (see below), whose sum is σ = 68995584. Its totient is φ = 5651200.

The previous prime is 21194387. The next prime is 21194441. The reversal of 21194400 is 449112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2016 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (958272).

Almost surely, 2^21194400 is an apocalyptic number.

21194400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21194400 is an abundant number, since it is smaller than the sum of its proper divisors (47801184).

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

21194400 is a wasteful number, since it uses less digits than its factorization.

21194400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854 (or 8841 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21194400 is about 4603.7376119844. The cubic root of 21194400 is about 276.7411292935.

The spelling of 21194400 in words is "twenty-one million, one hundred ninety-four thousand, four hundred".