21392000 has 128 divisors (see below), whose sum is σ = 61102080. Its totient is φ = 7296000.

The previous prime is 21391999. The next prime is 21392011. The reversal of 21392000 is 29312.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 21392000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111905 + ... + 112095.

It is an arithmetic number, because the mean of its divisors is an integer number (477360).

Almost surely, 2^21392000 is an apocalyptic number.

21392000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21392000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30551040).

21392000 is an abundant number, since it is smaller than the sum of its proper divisors (39710080).

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

21392000 is an equidigital number, since it uses as much as digits as its factorization.

21392000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21392000 is about 4625.1486462599. The cubic root of 21392000 is about 277.5985095165.

The spelling of 21392000 in words is "twenty-one million, three hundred ninety-two thousand".