21933383 has 4 divisors (see below), whose sum is σ = 23223600. Its totient is φ = 20643168.

The previous prime is 21933377. The next prime is 21933403. The reversal of 21933383 is 38333912.

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

It is not a de Polignac number, because 21933383 - 2⁸ = 21933127 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 (21933683) 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, 645083 + ... + 645116.

It is an arithmetic number, because the mean of its divisors is an integer number (5805900).

Almost surely, 2^21933383 is an apocalyptic number.

21933383 is a deficient number, since it is larger than the sum of its proper divisors (1290217).

21933383 is a wasteful number, since it uses less digits than its factorization.

21933383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290216.

The product of its digits is 11664, while the sum is 32.

The square root of 21933383 is about 4683.3089797706. The cubic root of 21933383 is about 279.9208237017.

The spelling of 21933383 in words is "twenty-one million, nine hundred thirty-three thousand, three hundred eighty-three".