21955753 has 2 divisors, whose sum is σ = 21955754. Its totient is φ = 21955752.

The previous prime is 21955733. The next prime is 21955771. The reversal of 21955753 is 35755912.

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., 17740944 + 4214809 = 4212^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 21955753 - 2¹⁷ = 21824681 is a prime.

It is not a weakly prime, because it can be changed into another prime (21955733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977876 + 10977877.

It is an arithmetic number, because the mean of its divisors is an integer number (10977877).

Almost surely, 2^21955753 is an apocalyptic number.

It is an amenable number.

21955753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21955753 is an equidigital number, since it uses as much as digits as its factorization.

21955753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47250, while the sum is 37.

The square root of 21955753 is about 4685.6966397751. The cubic root of 21955753 is about 280.0159557234.

The spelling of 21955753 in words is "twenty-one million, nine hundred fifty-five thousand, seven hundred fifty-three".