21934049 has 2 divisors, whose sum is σ = 21934050. Its totient is φ = 21934048.

The previous prime is 21934039. The next prime is 21934051. The reversal of 21934049 is 94043912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 10758400 = 3343^2 + 3280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21934049 is a prime.

It is a super-2 number, since 2×21934049² = 962205011068802, which contains 22 as substring.

Together with 21934051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21934039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967024 + 10967025.

It is an arithmetic number, because the mean of its divisors is an integer number (10967025).

Almost surely, 2^21934049 is an apocalyptic number.

It is an amenable number.

21934049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21934049 is an equidigital number, since it uses as much as digits as its factorization.

21934049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21934049 is about 4683.3800828034. The cubic root of 21934049 is about 279.9236569077.

The spelling of 21934049 in words is "twenty-one million, nine hundred thirty-four thousand, forty-nine".