123221222122 has 4 divisors (see below), whose sum is σ = 184831833186. Its totient is φ = 61610611060.

The previous prime is 123221222099. The next prime is 123221222129. The reversal of 123221222122 is 221222122321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221222122321 = 131 ⋅1688718491.

It can be written as a sum of positive squares in only one way, i.e., 81213030441 + 42008191681 = 284979^2 + 204959^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123221222093 and 123221222102.

It is not an unprimeable number, because it can be changed into a prime (123221222129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30805305529 + ... + 30805305532.

Almost surely, 2^123221222122 is an apocalyptic number.

123221222122 is a deficient number, since it is larger than the sum of its proper divisors (61610611064).

123221222122 is an equidigital number, since it uses as much as digits as its factorization.

123221222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61610611063.

The product of its digits is 768, while the sum is 22.

Adding to 123221222122 its reverse (221222122321), we get a palindrome (344443344443).

The spelling of 123221222122 in words is "one hundred twenty-three billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-two".