21332607973 has 2 divisors, whose sum is σ = 21332607974. Its totient is φ = 21332607972.

The previous prime is 21332607953. The next prime is 21332607991. The reversal of 21332607973 is 37970623312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21264347329 + 68260644 = 145823^2 + 8262^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332607973 - 2²¹ = 21330510821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332607953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666303986 + 10666303987.

It is an arithmetic number, because the mean of its divisors is an integer number (10666303987).

Almost surely, 2^21332607973 is an apocalyptic number.

It is an amenable number.

21332607973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332607973 is an equidigital number, since it uses as much as digits as its factorization.

21332607973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 43.

The spelling of 21332607973 in words is "twenty-one billion, three hundred thirty-two million, six hundred seven thousand, nine hundred seventy-three".