21764933 has 2 divisors, whose sum is σ = 21764934. Its totient is φ = 21764932.

The previous prime is 21764929. The next prime is 21764959. The reversal of 21764933 is 33946712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21687649 + 77284 = 4657^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 21764933 - 2² = 21764929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21764893 and 21764902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21769933) 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, 10882466 + 10882467.

It is an arithmetic number, because the mean of its divisors is an integer number (10882467).

Almost surely, 2^21764933 is an apocalyptic number.

It is an amenable number.

21764933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21764933 is an equidigital number, since it uses as much as digits as its factorization.

21764933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 21764933 is about 4665.2902374879. The cubic root of 21764933 is about 279.2023771154.

The spelling of 21764933 in words is "twenty-one million, seven hundred sixty-four thousand, nine hundred thirty-three".