115031612221 has 2 divisors, whose sum is σ = 115031612222. Its totient is φ = 115031612220.

The previous prime is 115031612149. The next prime is 115031612243. The reversal of 115031612221 is 122216130511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99887602500 + 15144009721 = 316050^2 + 123061^2 .

It is an emirp because it is prime and its reverse (122216130511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115031612221 - 2¹³ = 115031604029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115031612261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57515806110 + 57515806111.

It is an arithmetic number, because the mean of its divisors is an integer number (57515806111).

Almost surely, 2^115031612221 is an apocalyptic number.

It is an amenable number.

115031612221 is a deficient number, since it is larger than the sum of its proper divisors (1).

115031612221 is an equidigital number, since it uses as much as digits as its factorization.

115031612221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 115031612221 its reverse (122216130511), we get a palindrome (237247742732).

The spelling of 115031612221 in words is "one hundred fifteen billion, thirty-one million, six hundred twelve thousand, two hundred twenty-one".