21933365 has 4 divisors (see below), whose sum is σ = 26320044. Its totient is φ = 17546688.

The previous prime is 21933347. The next prime is 21933377. The reversal of 21933365 is 56333912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11135569 + 10797796 = 3337^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 21933365 - 2¹⁰ = 21932341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193332 + ... + 2193341.

It is an arithmetic number, because the mean of its divisors is an integer number (6580011).

Almost surely, 2^21933365 is an apocalyptic number.

It is an amenable number.

21933365 is a deficient number, since it is larger than the sum of its proper divisors (4386679).

21933365 is an equidigital number, since it uses as much as digits as its factorization.

21933365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386678.

The product of its digits is 14580, while the sum is 32.

The square root of 21933365 is about 4683.3070580520. The cubic root of 21933365 is about 279.9207471277.

The spelling of 21933365 in words is "twenty-one million, nine hundred thirty-three thousand, three hundred sixty-five".