1221121120000 has 90 divisors (see below), whose sum is σ = 3045865704728. Its totient is φ = 488448384000.

The previous prime is 1221121119941. The next prime is 1221121120061. The reversal of 1221121120000 is 211211221.

It is a super-2 number, since 2×1221121120000² (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 (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3656004 + ... + 3976003.

Almost surely, 2^{1221121120000} is an apocalyptic number.

1221121120000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221121120000 is an abundant number, since it is smaller than the sum of its proper divisors (1824744584728).

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

1221121120000 is an frugal number, since it uses more digits than its factorization.

1221121120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632043 (or 7632014 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221121120000 its reverse (211211221), we get a palindrome (1221332331221).

The spelling of 1221121120000 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand".