2121120120 has 128 divisors (see below), whose sum is σ = 7372247040. Its totient is φ = 478172160.

The previous prime is 2121120061. The next prime is 2121120137. The reversal of 2121120120 is 210211212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2121120096 and 2121120105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44025 + ... + 78615.

It is an arithmetic number, because the mean of its divisors is an integer number (57595680).

Almost surely, 2^2121120120 is an apocalyptic number.

2121120120 is a gapful number since it is divisible by the number (20) 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 2121120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3686123520).

2121120120 is an abundant number, since it is smaller than the sum of its proper divisors (5251126920).

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

2121120120 is a wasteful number, since it uses less digits than its factorization.

2121120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34685 (or 34681 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121120120 is about 46055.6198525218. The cubic root of 2121120120 is about 1284.8578665586.

Adding to 2121120120 its reverse (210211212), we get a palindrome (2331331332).

The spelling of 2121120120 in words is "two billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty".