1220111212120 has 16 divisors (see below), whose sum is σ = 2745250227360. Its totient is φ = 488044484832.

The previous prime is 1220111212109. The next prime is 1220111212129. The reversal of 1220111212120 is 212121110221.

It is a junction number, because it is equal to n+sod(n) for n = 1220111212094 and 1220111212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220111212129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15251390112 + ... + 15251390191.

It is an arithmetic number, because the mean of its divisors is an integer number (171578139210).

Almost surely, 2^{1220111212120} is an apocalyptic number.

1220111212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220111212120 is an abundant number, since it is smaller than the sum of its proper divisors (1525139015240).

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

1220111212120 is a wasteful number, since it uses less digits than its factorization.

1220111212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30502780314 (or 30502780310 counting only the distinct ones).

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

Adding to 1220111212120 its reverse (212121110221), we get a palindrome (1432232322341).

The spelling of 1220111212120 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty".