21893400 has 72 divisors (see below), whose sum is σ = 73531380. Its totient is φ = 5837760.

The previous prime is 21893393. The next prime is 21893423. The reversal of 21893400 is 439812.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4282 + ... + 7881.

Almost surely, 2^21893400 is an apocalyptic number.

21893400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21893400 is an abundant number, since it is smaller than the sum of its proper divisors (51637980).

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

21893400 is a wasteful number, since it uses less digits than its factorization.

21893400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12185 (or 12173 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21893400 is about 4679.0383627408. The cubic root of 21893400 is about 279.7506283124.

The spelling of 21893400 in words is "twenty-one million, eight hundred ninety-three thousand, four hundred".