21230320093 has 2 divisors, whose sum is σ = 21230320094. Its totient is φ = 21230320092.

The previous prime is 21230320079. The next prime is 21230320099. The reversal of 21230320093 is 39002303212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19011721689 + 2218598404 = 137883^2 + 47102^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230320093 - 2⁵ = 21230320061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230320099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615160046 + 10615160047.

It is an arithmetic number, because the mean of its divisors is an integer number (10615160047).

Almost surely, 2^21230320093 is an apocalyptic number.

It is an amenable number.

21230320093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230320093 is an equidigital number, since it uses as much as digits as its factorization.

21230320093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The spelling of 21230320093 in words is "twenty-one billion, two hundred thirty million, three hundred twenty thousand, ninety-three".