21899833 has 4 divisors (see below), whose sum is σ = 21909888. Its totient is φ = 21889780.

The previous prime is 21899831. The next prime is 21899909. The reversal of 21899833 is 33899812.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21899833 - 2¹ = 21899831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21899833.

It is not an unprimeable number, because it can be changed into a prime (21899831) 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, 241 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (5477472).

Almost surely, 2^21899833 is an apocalyptic number.

It is an amenable number.

21899833 is a deficient number, since it is larger than the sum of its proper divisors (10055).

21899833 is an equidigital number, since it uses as much as digits as its factorization.

21899833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10054.

The product of its digits is 93312, while the sum is 43.

The square root of 21899833 is about 4679.7257398271. The cubic root of 21899833 is about 279.7780256034.

The spelling of 21899833 in words is "twenty-one million, eight hundred ninety-nine thousand, eight hundred thirty-three".