21023032993 has 2 divisors, whose sum is σ = 21023032994. Its totient is φ = 21023032992.

The previous prime is 21023032981. The next prime is 21023033021. The reversal of 21023032993 is 39923032012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18402821649 + 2620211344 = 135657^2 + 51188^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023032993 - 2¹³ = 21023024801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023032903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511516496 + 10511516497.

It is an arithmetic number, because the mean of its divisors is an integer number (10511516497).

Almost surely, 2^21023032993 is an apocalyptic number.

It is an amenable number.

21023032993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023032993 is an equidigital number, since it uses as much as digits as its factorization.

21023032993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The spelling of 21023032993 in words is "twenty-one billion, twenty-three million, thirty-two thousand, nine hundred ninety-three".