21374983 has 4 divisors (see below), whose sum is σ = 24428560. Its totient is φ = 18321408.

The previous prime is 21374971. The next prime is 21375007. The reversal of 21374983 is 38947312.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21374983 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 (21374783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526778 + ... + 1526791.

It is an arithmetic number, because the mean of its divisors is an integer number (6107140).

Almost surely, 2^21374983 is an apocalyptic number.

21374983 is a deficient number, since it is larger than the sum of its proper divisors (3053577).

21374983 is an equidigital number, since it uses as much as digits as its factorization.

21374983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053576.

The product of its digits is 36288, while the sum is 37.

The square root of 21374983 is about 4623.3086637169. The cubic root of 21374983 is about 277.5248815717.

The spelling of 21374983 in words is "twenty-one million, three hundred seventy-four thousand, nine hundred eighty-three".