21115336316323 has 2 divisors, whose sum is σ = 21115336316324. Its totient is φ = 21115336316322.

The previous prime is 21115336316311. The next prime is 21115336316369. The reversal of 21115336316323 is 32361363351112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21115336316323 - 2²¹ = 21115334219171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21115336316303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557668158161 + 10557668158162.

It is an arithmetic number, because the mean of its divisors is an integer number (10557668158162).

Almost surely, 2^{21115336316323} is an apocalyptic number.

21115336316323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115336316323 is an equidigital number, since it uses as much as digits as its factorization.

21115336316323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 40.

Adding to 21115336316323 its reverse (32361363351112), we get a palindrome (53476699667435).

The spelling of 21115336316323 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-six million, three hundred sixteen thousand, three hundred twenty-three".