1212222111121 has 16 divisors (see below), whose sum is σ = 1399320123264. Its totient is φ = 1028654567424.

The previous prime is 1212222111091. The next prime is 1212222111127. The reversal of 1212222111121 is 1211112222121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1212222111121 - 2²¹ = 1212220013969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212222111127) 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, 1773730 + ... + 2360203.

It is an arithmetic number, because the mean of its divisors is an integer number (87457507704).

Almost surely, 2^{1212222111121} is an apocalyptic number.

It is an amenable number.

1212222111121 is a deficient number, since it is larger than the sum of its proper divisors (187098012143).

1212222111121 is a wasteful number, since it uses less digits than its factorization.

1212222111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134360.

The product of its digits is 64, while the sum is 19.

Adding to 1212222111121 its reverse (1211112222121), we get a palindrome (2423334333242).

It can be divided in two parts, 121222211 and 1121, that multiplied together give a palindrome (135890098531).

The spelling of 1212222111121 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty-one".