21938833 has 16 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 18331200.

The previous prime is 21938831. The next prime is 21938843. The reversal of 21938833 is 33883912.

It is a cyclic number.

It is not a de Polignac number, because 21938833 - 2¹ = 21938831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21938792 and 21938801.

It is not an unprimeable number, because it can be changed into a prime (21938831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81423 + ... + 81691.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^21938833 is an apocalyptic number.

It is an amenable number.

21938833 is a deficient number, since it is larger than the sum of its proper divisors (3773807).

21938833 is a wasteful number, since it uses less digits than its factorization.

21938833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 31104, while the sum is 37.

The square root of 21938833 is about 4683.8907971899. The cubic root of 21938833 is about 279.9440066606.

It can be divided in two parts, 2193 and 8833, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 21938833 in words is "twenty-one million, nine hundred thirty-eight thousand, eight hundred thirty-three".