21933613 has 8 divisors (see below), whose sum is σ = 23764608. Its totient is φ = 20123184.

The previous prime is 21933607. The next prime is 21933623. The reversal of 21933613 is 31633912.

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

It is a cyclic number.

It is not a de Polignac number, because 21933613 - 2¹⁷ = 21802541 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 (21933623) 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, 2881 + ... + 7222.

It is an arithmetic number, because the mean of its divisors is an integer number (2970576).

Almost surely, 2^21933613 is an apocalyptic number.

It is an amenable number.

21933613 is a deficient number, since it is larger than the sum of its proper divisors (1830995).

21933613 is a wasteful number, since it uses less digits than its factorization.

21933613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283.

The product of its digits is 2916, while the sum is 28.

The square root of 21933613 is about 4683.3335349941. Note that the first 3 decimals coincide. The cubic root of 21933613 is about 279.9218021427.

The spelling of 21933613 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred thirteen".