21935983 has 2 divisors, whose sum is σ = 21935984. Its totient is φ = 21935982.

The previous prime is 21935939. The next prime is 21935999. The reversal of 21935983 is 38953912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21935983 - 2⁹ = 21935471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21935183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967991 + 10967992.

It is an arithmetic number, because the mean of its divisors is an integer number (10967992).

Almost surely, 2^21935983 is an apocalyptic number.

21935983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21935983 is an equidigital number, since it uses as much as digits as its factorization.

21935983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 21935983 is about 4683.5865530595. The cubic root of 21935983 is about 279.9318839408.

The spelling of 21935983 in words is "twenty-one million, nine hundred thirty-five thousand, nine hundred eighty-three".