1221222001121 has 8 divisors (see below), whose sum is σ = 1222361910504. Its totient is φ = 1220082624640.

The previous prime is 1221222001093. The next prime is 1221222001177. The reversal of 1221222001121 is 1211002221221.

It can be written as a sum of positive squares in 4 ways, for example, as 5250451600 + 1215971549521 = 72460^2 + 1102711^2 .

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 2^k-1221222001121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221222001121.

It is not an unprimeable number, because it can be changed into a prime (1221222001921) 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, 4527941 + ... + 4790061.

It is an arithmetic number, because the mean of its divisors is an integer number (152795238813).

Almost surely, 2^{1221222001121} is an apocalyptic number.

It is an amenable number.

1221222001121 is a deficient number, since it is larger than the sum of its proper divisors (1139909383).

1221222001121 is a wasteful number, since it uses less digits than its factorization.

1221222001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266451.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221222001121 its reverse (1211002221221), we get a palindrome (2432224222342).

The spelling of 1221222001121 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one thousand, one hundred twenty-one".