1221121121120 has 24 divisors (see below), whose sum is σ = 2884898649024. Its totient is φ = 488448448384.

The previous prime is 1221121121071. The next prime is 1221121121147. The reversal of 1221121121120 is 211211211221.

It is a super-2 number, since 2×1221121121120² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3816003344 + ... + 3816003663.

It is an arithmetic number, because the mean of its divisors is an integer number (120204110376).

Almost surely, 2^{1221121121120} is an apocalyptic number.

1221121121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221121121120 is an abundant number, since it is smaller than the sum of its proper divisors (1663777527904).

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

1221121121120 is an equidigital number, since it uses as much as digits as its factorization.

1221121121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632007022 (or 7632007014 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221121121120 its reverse (211211211221), we get a palindrome (1432332332341).

The spelling of 1221121121120 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty".