121222138 has 32 divisors (see below), whose sum is σ = 199232784. Its totient is φ = 55084032.

The previous prime is 121222133. The next prime is 121222141. The reversal of 121222138 is 831222121.

It can be written as a sum of positive squares in 8 ways, for example, as 101747569 + 19474569 = 10087^2 + 4413^2 .

It is not an unprimeable number, because it can be changed into a prime (121222133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217356 + ... + 217912.

Almost surely, 2^121222138 is an apocalyptic number.

121222138 is a deficient number, since it is larger than the sum of its proper divisors (78010646).

121222138 is a wasteful number, since it uses less digits than its factorization.

121222138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its digits is 384, while the sum is 22.

The square root of 121222138 is about 11010.0925518362. The cubic root of 121222138 is about 494.9112353163.

Adding to 121222138 its reverse (831222121), we get a palindrome (952444259).

The spelling of 121222138 in words is "one hundred twenty-one million, two hundred twenty-two thousand, one hundred thirty-eight".