21322793 has 2 divisors, whose sum is σ = 21322794. Its totient is φ = 21322792.

The previous prime is 21322781. The next prime is 21322799. The reversal of 21322793 is 39722312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11916304 + 9406489 = 3452^2 + 3067^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322793 - 2⁶ = 21322729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21322799) 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, 10661396 + 10661397.

It is an arithmetic number, because the mean of its divisors is an integer number (10661397).

Almost surely, 2^21322793 is an apocalyptic number.

It is an amenable number.

21322793 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322793 is an equidigital number, since it uses as much as digits as its factorization.

21322793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 21322793 is about 4617.6609879895. The cubic root of 21322793 is about 277.2988255971.

The spelling of 21322793 in words is "twenty-one million, three hundred twenty-two thousand, seven hundred ninety-three".