1220121221121 has 12 divisors (see below), whose sum is σ = 1922615257680. Its totient is φ = 739467406680.

The previous prime is 1220121221113. The next prime is 1220121221141. The reversal of 1220121221121 is 1211221210221.

1220121221121 is a `hidden beast` number, since 1 + 220 + 1 + 212 + 211 + 21 = 666.

It is not a de Polignac number, because 1220121221121 - 2³ = 1220121221113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220121221094 and 1220121221103.

It is not an unprimeable number, because it can be changed into a prime (1220121221141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6162228291 + ... + 6162228488.

It is an arithmetic number, because the mean of its divisors is an integer number (160217938140).

Almost surely, 2^{1220121221121} is an apocalyptic number.

1220121221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220121221121 is a deficient number, since it is larger than the sum of its proper divisors (702494036559).

1220121221121 is a wasteful number, since it uses less digits than its factorization.

1220121221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12324456796 (or 12324456793 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1220121221121 its reverse (1211221210221), we get a palindrome (2431342431342).

The spelling of 1220121221121 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".