21111321131297 has 2 divisors, whose sum is σ = 21111321131298. Its totient is φ = 21111321131296.

The previous prime is 21111321131207. The next prime is 21111321131311. The reversal of 21111321131297 is 79213112311112.

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., 20877259658896 + 234061472401 = 4569164^2 + 483799^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111321131297 - 2¹² = 21111321127201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111321131207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555660565648 + 10555660565649.

It is an arithmetic number, because the mean of its divisors is an integer number (10555660565649).

Almost surely, 2^{21111321131297} is an apocalyptic number.

It is an amenable number.

21111321131297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111321131297 is an equidigital number, since it uses as much as digits as its factorization.

21111321131297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 35.

The spelling of 21111321131297 in words is "twenty-one trillion, one hundred eleven billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred ninety-seven".