21345324097 has 2 divisors, whose sum is σ = 21345324098. Its totient is φ = 21345324096.

The previous prime is 21345324079. The next prime is 21345324113. The reversal of 21345324097 is 79042354312.

Together with previous prime (21345324079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17026074256 + 4319249841 = 130484^2 + 65721^2 .

It is a cyclic number.

It is not a de Polignac number, because 21345324097 - 2¹⁹ = 21344799809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21345324017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672662048 + 10672662049.

It is an arithmetic number, because the mean of its divisors is an integer number (10672662049).

Almost surely, 2^21345324097 is an apocalyptic number.

It is an amenable number.

21345324097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21345324097 is an equidigital number, since it uses as much as digits as its factorization.

21345324097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 21345324097 in words is "twenty-one billion, three hundred forty-five million, three hundred twenty-four thousand, ninety-seven".