1221121121022 has 32 divisors (see below), whose sum is σ = 2960293628160. Its totient is φ = 370036703160.

The previous prime is 1221121120979. The next prime is 1221121121047. The reversal of 1221121121022 is 2201211211221.

1221121121022 is a `hidden beast` number, since 1 + 221 + 1 + 211 + 210 + 22 = 666.

It is a super-2 number, since 2×1221121121022² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221121120986 and 1221121121004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027879138 + ... + 1027880325.

It is an arithmetic number, because the mean of its divisors is an integer number (92509175880).

Almost surely, 2^{1221121121022} is an apocalyptic number.

1221121121022 is an abundant number, since it is smaller than the sum of its proper divisors (1739172507138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221121121022 is a wasteful number, since it uses less digits than its factorization.

1221121121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055759485 (or 2055759479 counting only the distinct ones).

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

Adding to 1221121121022 its reverse (2201211211221), we get a palindrome (3422332332243).

The spelling of 1221121121022 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty-two".