21933853 has 4 divisors (see below), whose sum is σ = 21989500. Its totient is φ = 21878208.

The previous prime is 21933851. The next prime is 21933869. The reversal of 21933853 is 35833912.

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 14953689 + 6980164 = 3867^2 + 2642^2 .

It is a cyclic number.

It is not a de Polignac number, because 21933853 - 2¹ = 21933851 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 (21933851) 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, 27228 + ... + 28021.

It is an arithmetic number, because the mean of its divisors is an integer number (5497375).

Almost surely, 2^21933853 is an apocalyptic number.

It is an amenable number.

21933853 is a deficient number, since it is larger than the sum of its proper divisors (55647).

21933853 is an equidigital number, since it uses as much as digits as its factorization.

21933853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55646.

The product of its digits is 19440, while the sum is 34.

The square root of 21933853 is about 4683.3591576987. The cubic root of 21933853 is about 279.9228231173.

The spelling of 21933853 in words is "twenty-one million, nine hundred thirty-three thousand, eight hundred fifty-three".