1213111220120 has 32 divisors (see below), whose sum is σ = 2792976999120. Its totient is φ = 473959731840.

The previous prime is 1213111220117. The next prime is 1213111220131. The reversal of 1213111220120 is 210221113121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352646891 + ... + 352650330.

Almost surely, 2^{1213111220120} is an apocalyptic number.

1213111220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213111220120 is an abundant number, since it is smaller than the sum of its proper divisors (1579865779000).

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

1213111220120 is a wasteful number, since it uses less digits than its factorization.

1213111220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705297275 (or 705297271 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1213111220120 its reverse (210221113121), we get a palindrome (1423332333241).

It can be divided in two parts, 121311 and 1220120, that added together give a palindrome (1341431).

The spelling of 1213111220120 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty".