1221201110120 has 64 divisors (see below), whose sum is σ = 2869503408000. Its totient is φ = 466861550848.

The previous prime is 1221201110113. The next prime is 1221201110177. The reversal of 1221201110120 is 210111021221.

It is a junction number, because it is equal to n+sod(n) for n = 1221201110095 and 1221201110104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590651 + ... + 1670709.

It is an arithmetic number, because the mean of its divisors is an integer number (44835990750).

Almost surely, 2^{1221201110120} is an apocalyptic number.

1221201110120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221201110120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434751704000).

1221201110120 is an abundant number, since it is smaller than the sum of its proper divisors (1648302297880).

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

1221201110120 is a wasteful number, since it uses less digits than its factorization.

1221201110120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081322 (or 1081318 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221201110120 its reverse (210111021221), we get a palindrome (1431312131341).

The spelling of 1221201110120 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred twenty".