1221020120120 has 48 divisors (see below), whose sum is σ = 2774766457080. Its totient is φ = 483572163200.

The previous prime is 1221020120071. The next prime is 1221020120123. The reversal of 1221020120120 is 210210201221.

It is a junction number, because it is equal to n+sod(n) for n = 1221020120095 and 1221020120104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221020120123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1088162 + ... + 1904241.

Almost surely, 2^{1221020120120} is an apocalyptic number.

1221020120120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221020120120 is an abundant number, since it is smaller than the sum of its proper divisors (1553746336960).

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

1221020120120 is a wasteful number, since it uses less digits than its factorization.

1221020120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992616 (or 2992511 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221020120120 its reverse (210210201221), we get a palindrome (1431230321341).

It can be divided in two parts, 12210201201 and 20, that added together give a palindrome (12210201221).

The spelling of 1221020120120 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty thousand, one hundred twenty".