21323013097 has 2 divisors, whose sum is σ = 21323013098. Its totient is φ = 21323013096.

The previous prime is 21323013001. The next prime is 21323013133. The reversal of 21323013097 is 79031032312.

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., 18840582121 + 2482430976 = 137261^2 + 49824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323013097 - 2¹⁹ = 21322488809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21323016097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661506548 + 10661506549.

It is an arithmetic number, because the mean of its divisors is an integer number (10661506549).

Almost surely, 2^21323013097 is an apocalyptic number.

It is an amenable number.

21323013097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323013097 is an equidigital number, since it uses as much as digits as its factorization.

21323013097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The spelling of 21323013097 in words is "twenty-one billion, three hundred twenty-three million, thirteen thousand, ninety-seven".