21115514135323 has 2 divisors, whose sum is σ = 21115514135324. Its totient is φ = 21115514135322.

The previous prime is 21115514135297. The next prime is 21115514135461. The reversal of 21115514135323 is 32353141551112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21115514135323 - 2⁹ = 21115514134811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21115514735323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557757067661 + 10557757067662.

It is an arithmetic number, because the mean of its divisors is an integer number (10557757067662).

Almost surely, 2^{21115514135323} is an apocalyptic number.

21115514135323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115514135323 is an equidigital number, since it uses as much as digits as its factorization.

21115514135323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

Adding to 21115514135323 its reverse (32353141551112), we get a palindrome (53468655686435).

The spelling of 21115514135323 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fourteen million, one hundred thirty-five thousand, three hundred twenty-three".