2121240120 has 32 divisors (see below), whose sum is σ = 6363720720. Its totient is φ = 565664000.

The previous prime is 2121240103. The next prime is 2121240133. The reversal of 2121240120 is 210421212.

It is a super-2 number, since 2×2121240120² = 8999319293395228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121240120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8838381 + ... + 8838620.

Almost surely, 2^2121240120 is an apocalyptic number.

2121240120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121240120 is an abundant number, since it is smaller than the sum of its proper divisors (4242480600).

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

2121240120 is a wasteful number, since it uses less digits than its factorization.

2121240120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17677015 (or 17677011 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2121240120 is about 46056.9226067048. The cubic root of 2121240120 is about 1284.8820959009.

Adding to 2121240120 its reverse (210421212), we get a palindrome (2331661332).

The spelling of 2121240120 in words is "two billion, one hundred twenty-one million, two hundred forty thousand, one hundred twenty".