21231320099993 has 2 divisors, whose sum is σ = 21231320099994. Its totient is φ = 21231320099992.

The previous prime is 21231320099963. The next prime is 21231320100007. The reversal of 21231320099993 is 39999002313212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10886779438144 + 10344540661849 = 3299512^2 + 3216293^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231320099993 - 2⁶ = 21231320099929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231320099963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615660049996 + 10615660049997.

It is an arithmetic number, because the mean of its divisors is an integer number (10615660049997).

Almost surely, 2^{21231320099993} is an apocalyptic number.

It is an amenable number.

21231320099993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231320099993 is an equidigital number, since it uses as much as digits as its factorization.

21231320099993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 53.

The spelling of 21231320099993 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty million, ninety-nine thousand, nine hundred ninety-three".