21937049 has 2 divisors, whose sum is σ = 21937050. Its totient is φ = 21937048.

The previous prime is 21937031. The next prime is 21937061. The reversal of 21937049 is 94073912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 1974025 = 4468^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 21937049 - 2²⁰ = 20888473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21937549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968524 + 10968525.

It is an arithmetic number, because the mean of its divisors is an integer number (10968525).

Almost surely, 2^21937049 is an apocalyptic number.

It is an amenable number.

21937049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21937049 is an equidigital number, since it uses as much as digits as its factorization.

21937049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 21937049 is about 4683.7003533531. The cubic root of 21937049 is about 279.9364183863.

The spelling of 21937049 in words is "twenty-one million, nine hundred thirty-seven thousand, forty-nine".