Adding to 1222002121 its reverse (1212002221), we get a palindrome (2434004342).
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1222002121 is a prime.
It is a Duffinian number.
Almost surely, 21222002121 is an apocalyptic number.
It is an amenable number.
1222002121 is a wasteful number, since it uses less digits than its factorization.
1222002121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 338591.
The square root of 1222002121 is about 34957.1469230542. The cubic root of 1222002121 is about 1069.1139259432.
The spelling of 1222002121 in words is "one billion, two hundred twenty-two million, two thousand, one hundred twenty-one".