2121113256 has 32 divisors (see below), whose sum is σ = 5614712640. Its totient is φ = 665447168.

The previous prime is 2121113219. The next prime is 2121113287. The reversal of 2121113256 is 6523111212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2598996 + ... + 2599811.

It is an arithmetic number, because the mean of its divisors is an integer number (175459770).

Almost surely, 2^2121113256 is an apocalyptic number.

It is an amenable number.

2121113256 is an abundant number, since it is smaller than the sum of its proper divisors (3493599384).

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

2121113256 is a wasteful number, since it uses less digits than its factorization.

2121113256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5198833 (or 5198829 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 2121113256 is about 46055.5453338683. The cubic root of 2121113256 is about 1284.8564806126.

Adding to 2121113256 its reverse (6523111212), we get a palindrome (8644224468).

The spelling of 2121113256 in words is "two billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred fifty-six".