21376983 has 4 divisors (see below), whose sum is σ = 28502648. Its totient is φ = 14251320.

The previous prime is 21376981. The next prime is 21376991. The reversal of 21376983 is 38967312.

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

It is not a de Polignac number, because 21376983 - 2¹ = 21376981 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 (21376981) 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, 3562828 + ... + 3562833.

It is an arithmetic number, because the mean of its divisors is an integer number (7125662).

Almost surely, 2^21376983 is an apocalyptic number.

21376983 is a deficient number, since it is larger than the sum of its proper divisors (7125665).

21376983 is an equidigital number, since it uses as much as digits as its factorization.

21376983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7125664.

The product of its digits is 54432, while the sum is 39.

The square root of 21376983 is about 4623.5249539718. The cubic root of 21376983 is about 277.5335370554.

The spelling of 21376983 in words is "twenty-one million, three hundred seventy-six thousand, nine hundred eighty-three".