21115334625337 has 2 divisors, whose sum is σ = 21115334625338. Its totient is φ = 21115334625336.

The previous prime is 21115334625317. The next prime is 21115334625487. The reversal of 21115334625337 is 73352643351112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19531308491776 + 1584026133561 = 4419424^2 + 1258581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21115334625337 is a prime.

It is not a weakly prime, because it can be changed into another prime (21115334625317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557667312668 + 10557667312669.

It is an arithmetic number, because the mean of its divisors is an integer number (10557667312669).

Almost surely, 2^{21115334625337} is an apocalyptic number.

It is an amenable number.

21115334625337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115334625337 is an equidigital number, since it uses as much as digits as its factorization.

21115334625337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 46.

Adding to 21115334625337 its reverse (73352643351112), we get a palindrome (94467977976449).

The spelling of 21115334625337 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-four million, six hundred twenty-five thousand, three hundred thirty-seven".