2121240312 has 48 divisors (see below), whose sum is σ = 5957810040. Its totient is φ = 707079456.

The previous prime is 2121240283. The next prime is 2121240323. The reversal of 2121240312 is 2130421212.

It is a happy number.

It is a super-2 number, since 2×2121240312² = 8999320922507714688, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 543643 + ... + 547530.

Almost surely, 2^2121240312 is an apocalyptic number.

It is an amenable number.

2121240312 is an abundant number, since it is smaller than the sum of its proper divisors (3836569728).

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

2121240312 is a wasteful number, since it uses less digits than its factorization.

2121240312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091194 (or 1091178 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2121240312 is about 46056.9246910820. The cubic root of 2121240312 is about 1284.8821346671.

Adding to 2121240312 its reverse (2130421212), we get a palindrome (4251661524).

Subtracting 2121240312 from its reverse (2130421212), we obtain a square (9180900 = 3030²).

The spelling of 2121240312 in words is "two billion, one hundred twenty-one million, two hundred forty thousand, three hundred twelve".