1222121121 has 8 divisors (see below), whose sum is σ = 1754840640. Its totient is φ = 752074512.

The previous prime is 1222121111. The next prime is 1222121129. The reversal of 1222121121 is 1211212221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1222121121 - 2⁶ = 1222121057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222121121.

It is not an unprimeable number, because it can be changed into a prime (1222121129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15668181 + ... + 15668258.

It is an arithmetic number, because the mean of its divisors is an integer number (219355080).

Almost surely, 2^1222121121 is an apocalyptic number.

It is an amenable number.

1222121121 is a deficient number, since it is larger than the sum of its proper divisors (532719519).

1222121121 is a wasteful number, since it uses less digits than its factorization.

1222121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31336455.

The product of its digits is 32, while the sum is 15.

The square root of 1222121121 is about 34958.8489656053. The cubic root of 1222121121 is about 1069.1486286729.

Adding to 1222121121 its reverse (1211212221), we get a palindrome (2433333342).

The spelling of 1222121121 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".