21268400 has 30 divisors (see below), whose sum is σ = 51098292. Its totient is φ = 8507200.

The previous prime is 21268369. The next prime is 21268421. The reversal of 21268400 is 486212.

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, 26186 + ... + 26985.

Almost surely, 2^21268400 is an apocalyptic number.

21268400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21268400 is an abundant number, since it is smaller than the sum of its proper divisors (29829892).

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

21268400 is a wasteful number, since it uses less digits than its factorization.

21268400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53189 (or 53178 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21268400 is about 4611.7675570219. The cubic root of 21268400 is about 277.0628346466.

The spelling of 21268400 in words is "twenty-one million, two hundred sixty-eight thousand, four hundred".