1222220212121 has 4 divisors (see below), whose sum is σ = 1233433241700. Its totient is φ = 1211007182544.

The previous prime is 1222220212099. The next prime is 1222220212151. The reversal of 1222220212121 is 1212120222221.

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 446138500096 + 776081712025 = 667936^2 + 880955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222220212121 - 2¹⁰ = 1222220211097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222220212093 and 1222220212102.

It is not an unprimeable number, because it can be changed into a prime (1222220212151) 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, 5606514626 + ... + 5606514843.

It is an arithmetic number, because the mean of its divisors is an integer number (308358310425).

Almost surely, 2^{1222220212121} is an apocalyptic number.

It is an amenable number.

1222220212121 is a deficient number, since it is larger than the sum of its proper divisors (11213029579).

1222220212121 is a wasteful number, since it uses less digits than its factorization.

1222220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213029578.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1222220212121 its reverse (1212120222221), we get a palindrome (2434340434342).

It can be divided in two parts, 1222220 and 212121, that added together give a palindrome (1434341).

The spelling of 1222220212121 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".