122715391321 has 4 divisors (see below), whose sum is σ = 122768911012. Its totient is φ = 122661871632.

The previous prime is 122715391313. The next prime is 122715391343. The reversal of 122715391321 is 123193517221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92242801225 + 30472590096 = 303715^2 + 174564^2 .

It is a cyclic number.

It is not a de Polignac number, because 122715391321 - 2³ = 122715391313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122715395321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26756406 + ... + 26760991.

It is an arithmetic number, because the mean of its divisors is an integer number (30692227753).

Almost surely, 2^122715391321 is an apocalyptic number.

It is an amenable number.

122715391321 is a deficient number, since it is larger than the sum of its proper divisors (53519691).

122715391321 is an equidigital number, since it uses as much as digits as its factorization.

122715391321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53519690.

The product of its digits is 22680, while the sum is 37.

The spelling of 122715391321 in words is "one hundred twenty-two billion, seven hundred fifteen million, three hundred ninety-one thousand, three hundred twenty-one".