122547165221 has 4 divisors (see below), whose sum is σ = 131973870252. Its totient is φ = 113120460192.

The previous prime is 122547165211. The next prime is 122547165227. The reversal of 122547165221 is 122561745221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122561745221 = 359 ⋅341397619.

It can be written as a sum of positive squares in 2 ways, for example, as 49057377121 + 73489788100 = 221489^2 + 271090^2 .

It is a cyclic number.

It is not a de Polignac number, because 122547165221 - 2⁶ = 122547165157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122547165227) 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, 4713352496 + ... + 4713352521.

It is an arithmetic number, because the mean of its divisors is an integer number (32993467563).

Almost surely, 2^122547165221 is an apocalyptic number.

It is an amenable number.

122547165221 is a deficient number, since it is larger than the sum of its proper divisors (9426705031).

122547165221 is an equidigital number, since it uses as much as digits as its factorization.

122547165221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426705030.

The product of its digits is 67200, while the sum is 38.

The spelling of 122547165221 in words is "one hundred twenty-two billion, five hundred forty-seven million, one hundred sixty-five thousand, two hundred twenty-one".