21296400 has 60 divisors (see below), whose sum is σ = 68223312. Its totient is φ = 5678720.

The previous prime is 21296399. The next prime is 21296417. The reversal of 21296400 is 469212.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 7674 + ... + 10073.

Almost surely, 2^21296400 is an apocalyptic number.

21296400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21296400 is an abundant number, since it is smaller than the sum of its proper divisors (46926912).

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

21296400 is a wasteful number, since it uses less digits than its factorization.

21296400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17768 (or 17757 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21296400 is about 4614.8022709538. The cubic root of 21296400 is about 277.1843663945.

The spelling of 21296400 in words is "twenty-one million, two hundred ninety-six thousand, four hundred".