1222021220121 has 24 divisors (see below), whose sum is σ = 1900960433736. Its totient is φ = 751997813760.

The previous prime is 1222021220117. The next prime is 1222021220141. The reversal of 1222021220121 is 1210221202221.

It is a happy number.

1222021220121 is a `hidden beast` number, since 12 + 220 + 212 + 201 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 519316244496 + 702704975625 = 720636^2 + 838275^2 .

It is not a de Polignac number, because 1222021220121 - 2² = 1222021220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222021220094 and 1222021220103.

It is not an unprimeable number, because it can be changed into a prime (1222021220141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9087451 + ... + 9220943.

It is an arithmetic number, because the mean of its divisors is an integer number (79206684739).

Almost surely, 2^{1222021220121} is an apocalyptic number.

It is an amenable number.

1222021220121 is a deficient number, since it is larger than the sum of its proper divisors (678939213615).

1222021220121 is a wasteful number, since it uses less digits than its factorization.

1222021220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211753 (or 211750 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222021220121 its reverse (1210221202221), we get a palindrome (2432242422342).

The spelling of 1222021220121 in words is "one trillion, two hundred twenty-two billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".