21342311297 has 2 divisors, whose sum is σ = 21342311298. Its totient is φ = 21342311296.

The previous prime is 21342311261. The next prime is 21342311321. The reversal of 21342311297 is 79211324312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17833999936 + 3508311361 = 133544^2 + 59231^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342311297 - 2⁶ = 21342311233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342311197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671155648 + 10671155649.

It is an arithmetic number, because the mean of its divisors is an integer number (10671155649).

Almost surely, 2^21342311297 is an apocalyptic number.

It is an amenable number.

21342311297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342311297 is an equidigital number, since it uses as much as digits as its factorization.

21342311297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The spelling of 21342311297 in words is "twenty-one billion, three hundred forty-two million, three hundred eleven thousand, two hundred ninety-seven".