21833939 has 2 divisors, whose sum is σ = 21833940. Its totient is φ = 21833938.

The previous prime is 21833921. The next prime is 21833957. The reversal of 21833939 is 93933812.

It is a balanced prime because it is at equal distance from previous prime (21833921) and next prime (21833957).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21833939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21833909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10916969 + 10916970.

It is an arithmetic number, because the mean of its divisors is an integer number (10916970).

Almost surely, 2^21833939 is an apocalyptic number.

21833939 is a deficient number, since it is larger than the sum of its proper divisors (1).

21833939 is an equidigital number, since it uses as much as digits as its factorization.

21833939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 21833939 is about 4672.6800660863. The cubic root of 21833939 is about 279.4971373966.

The spelling of 21833939 in words is "twenty-one million, eight hundred thirty-three thousand, nine hundred thirty-nine".