21992233 has 4 divisors (see below), whose sum is σ = 22050640. Its totient is φ = 21933828.

The previous prime is 21992231. The next prime is 21992239. The reversal of 21992233 is 33229912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21992233 - 2¹ = 21992231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21992195 and 21992204.

It is not an unprimeable number, because it can be changed into a prime (21992231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28635 + ... + 29392.

It is an arithmetic number, because the mean of its divisors is an integer number (5512660).

Almost surely, 2^21992233 is an apocalyptic number.

It is an amenable number.

21992233 is a deficient number, since it is larger than the sum of its proper divisors (58407).

21992233 is an equidigital number, since it uses as much as digits as its factorization.

21992233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58406.

The product of its digits is 5832, while the sum is 31.

The square root of 21992233 is about 4689.5877217512. The cubic root of 21992233 is about 280.1709542759.

The spelling of 21992233 in words is "twenty-one million, nine hundred ninety-two thousand, two hundred thirty-three".