21358983 has 8 divisors (see below), whose sum is σ = 29977600. Its totient is φ = 13489848.

The previous prime is 21358979. The next prime is 21358999. The reversal of 21358983 is 38985312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21358983 - 2² = 21358979 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21358903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187303 + ... + 187416.

It is an arithmetic number, because the mean of its divisors is an integer number (3747200).

Almost surely, 2^21358983 is an apocalyptic number.

21358983 is a deficient number, since it is larger than the sum of its proper divisors (8618617).

21358983 is a wasteful number, since it uses less digits than its factorization.

21358983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374741.

The product of its digits is 51840, while the sum is 39.

The square root of 21358983 is about 4621.5779772714. The cubic root of 21358983 is about 277.4556182573.

The spelling of 21358983 in words is "twenty-one million, three hundred fifty-eight thousand, nine hundred eighty-three".