1212231222121 has 4 divisors (see below), whose sum is σ = 1212234183892. Its totient is φ = 1212228260352.

The previous prime is 1212231222113. The next prime is 1212231222173. The reversal of 1212231222121 is 1212221322121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1206746190400 + 5485031721 = 1098520^2 + 74061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212231222121 - 2³ = 1212231222113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212231222092 and 1212231222101.

It is not an unprimeable number, because it can be changed into a prime (1212231220121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745080 + ... + 1726153.

It is an arithmetic number, because the mean of its divisors is an integer number (303058545973).

Almost surely, 2^{1212231222121} is an apocalyptic number.

It is an amenable number.

1212231222121 is a deficient number, since it is larger than the sum of its proper divisors (2961771).

1212231222121 is an equidigital number, since it uses as much as digits as its factorization.

1212231222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961770.

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

Adding to 1212231222121 its reverse (1212221322121), we get a palindrome (2424452544242).

The spelling of 1212231222121 in words is "one trillion, two hundred twelve billion, two hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".