21343240097 has 2 divisors, whose sum is σ = 21343240098. Its totient is φ = 21343240096.

The previous prime is 21343240067. The next prime is 21343240123. The reversal of 21343240097 is 79004234312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20538042721 + 805197376 = 143311^2 + 28376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343240097 - 2⁶ = 21343240033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343240067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671620048 + 10671620049.

It is an arithmetic number, because the mean of its divisors is an integer number (10671620049).

Almost surely, 2^21343240097 is an apocalyptic number.

It is an amenable number.

21343240097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343240097 is an equidigital number, since it uses as much as digits as its factorization.

21343240097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 21343240097 in words is "twenty-one billion, three hundred forty-three million, two hundred forty thousand, ninety-seven".