21349983 has 8 divisors (see below), whose sum is σ = 28672000. Its totient is φ = 14130648.

The previous prime is 21349969. The next prime is 21349997. The reversal of 21349983 is 38994312.

It is an interprime number because it is at equal distance from previous prime (21349969) and next prime (21349997).

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

It is not a de Polignac number, because 21349983 - 2⁴ = 21349967 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 (21349963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25183 + ... + 26016.

It is an arithmetic number, because the mean of its divisors is an integer number (3584000).

Almost surely, 2^21349983 is an apocalyptic number.

21349983 is a deficient number, since it is larger than the sum of its proper divisors (7322017).

21349983 is a wasteful number, since it uses less digits than its factorization.

21349983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51341.

The product of its digits is 46656, while the sum is 39.

The square root of 21349983 is about 4620.6041812733. The cubic root of 21349983 is about 277.4166424412.

The spelling of 21349983 in words is "twenty-one million, three hundred forty-nine thousand, nine hundred eighty-three".