21133983 has 16 divisors (see below), whose sum is σ = 31088736. Its totient is φ = 12687360.

The previous prime is 21133979. The next prime is 21134021. The reversal of 21133983 is 38933112.

It is not a de Polignac number, because 21133983 - 2² = 21133979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21133983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5010 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (1943046).

Almost surely, 2^21133983 is an apocalyptic number.

21133983 is a deficient number, since it is larger than the sum of its proper divisors (9954753).

21133983 is a wasteful number, since it uses less digits than its factorization.

21133983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13274.

The product of its digits is 3888, while the sum is 30.

The square root of 21133983 is about 4597.1711954201. The cubic root of 21133983 is about 276.4779185507.

The spelling of 21133983 in words is "twenty-one million, one hundred thirty-three thousand, nine hundred eighty-three".