2121123312 has 120 divisors (see below), whose sum is σ = 7401014400. Its totient is φ = 550938240.

The previous prime is 2121123299. The next prime is 2121123341. The reversal of 2121123312 is 2133211212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

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 23 ways as a sum of consecutive naturals, for example, 84562 + ... + 106737.

It is an arithmetic number, because the mean of its divisors is an integer number (61675120).

Almost surely, 2^2121123312 is an apocalyptic number.

2121123312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2121123312 is an abundant number, since it is smaller than the sum of its proper divisors (5279891088).

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

2121123312 is a wasteful number, since it uses less digits than its factorization.

2121123312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191331 (or 191322 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2121123312 is about 46055.6545062601. The cubic root of 2121123312 is about 1284.8585110709.

Adding to 2121123312 its reverse (2133211212), we get a palindrome (4254334524).

The spelling of 2121123312 in words is "two billion, one hundred twenty-one million, one hundred twenty-three thousand, three hundred twelve".