1221201121120 has 48 divisors (see below), whose sum is σ = 2901027428208. Its totient is φ = 485781649920.

The previous prime is 1221201121099. The next prime is 1221201121187. The reversal of 1221201121120 is 211211021221.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1221201121094 and 1221201121103.

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 7 ways as a sum of consecutive naturals, for example, 21055314 + ... + 21113233.

It is an arithmetic number, because the mean of its divisors is an integer number (60438071421).

Almost surely, 2^{1221201121120} is an apocalyptic number.

1221201121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221201121120 is an abundant number, since it is smaller than the sum of its proper divisors (1679826307088).

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

1221201121120 is a wasteful number, since it uses less digits than its factorization.

1221201121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42168743 (or 42168735 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221201121120 its reverse (211211021221), we get a palindrome (1432412142341).

The spelling of 1221201121120 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty".