21833291 has 2 divisors, whose sum is σ = 21833292. Its totient is φ = 21833290.

The previous prime is 21833267. The next prime is 21833311. The reversal of 21833291 is 19233812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21833291 is a prime.

It is a Sophie Germain prime.

It is equal to p_1379342 and since 21833291 and 1379342 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21833891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10916645 + 10916646.

It is an arithmetic number, because the mean of its divisors is an integer number (10916646).

Almost surely, 2^21833291 is an apocalyptic number.

21833291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21833291 is an equidigital number, since it uses as much as digits as its factorization.

21833291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 21833291 is about 4672.6107263499. The cubic root of 21833291 is about 279.4943723445.

The spelling of 21833291 in words is "twenty-one million, eight hundred thirty-three thousand, two hundred ninety-one".