21937753 has 2 divisors, whose sum is σ = 21937754. Its totient is φ = 21937752.

The previous prime is 21937709. The next prime is 21937763. The reversal of 21937753 is 35773912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17040384 + 4897369 = 4128^2 + 2213^2 .

It is a cyclic number.

It is not a de Polignac number, because 21937753 - 2⁹ = 21937241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21937763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968876 + 10968877.

It is an arithmetic number, because the mean of its divisors is an integer number (10968877).

Almost surely, 2^21937753 is an apocalyptic number.

It is an amenable number.

21937753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21937753 is an equidigital number, since it uses as much as digits as its factorization.

21937753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 37.

The square root of 21937753 is about 4683.7755070029. The cubic root of 21937753 is about 279.9394129114.

The spelling of 21937753 in words is "twenty-one million, nine hundred thirty-seven thousand, seven hundred fifty-three".