21183420 has 24 divisors (see below), whose sum is σ = 59313744. Its totient is φ = 5648896.

The previous prime is 21183389. The next prime is 21183431. The reversal of 21183420 is 2438112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176469 + ... + 176588.

It is an arithmetic number, because the mean of its divisors is an integer number (2471406).

Almost surely, 2^21183420 is an apocalyptic number.

21183420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21183420 is an abundant number, since it is smaller than the sum of its proper divisors (38130324).

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

21183420 is a wasteful number, since it uses less digits than its factorization.

21183420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353069 (or 353067 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21183420 is about 4602.5449481781. The cubic root of 21183420 is about 276.6933314085.

The spelling of 21183420 in words is "twenty-one million, one hundred eighty-three thousand, four hundred twenty".