122910217 has 4 divisors (see below), whose sum is σ = 125525376. Its totient is φ = 120295060.

The previous prime is 122910199. The next prime is 122910223. The reversal of 122910217 is 712019221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712019221 = 4973 ⋅143177.

It is a cyclic number.

It is not a de Polignac number, because 122910217 - 2¹⁵ = 122877449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122910191 and 122910200.

It is not an unprimeable number, because it can be changed into a prime (122910247) 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, 1307509 + ... + 1307602.

It is an arithmetic number, because the mean of its divisors is an integer number (31381344).

Almost surely, 2^122910217 is an apocalyptic number.

It is an amenable number.

122910217 is a deficient number, since it is larger than the sum of its proper divisors (2615159).

122910217 is an equidigital number, since it uses as much as digits as its factorization.

122910217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615158.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 122910217 is about 11086.4880372461. The cubic root of 122910217 is about 497.1979490210.

Adding to 122910217 its reverse (712019221), we get a palindrome (834929438).

The spelling of 122910217 in words is "one hundred twenty-two million, nine hundred ten thousand, two hundred seventeen".