2121212304 has 30 divisors (see below), whose sum is σ = 5936448726. Its totient is φ = 707070720.

The previous prime is 2121212299. The next prime is 2121212311. The reversal of 2121212304 is 4032121212.

It is a happy number.

2121212304 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1940578704 + 180633600 = 44052^2 + 13440^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7365177 + ... + 7365464.

Almost surely, 2^2121212304 is an apocalyptic number.

2121212304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2121212304 is an abundant number, since it is smaller than the sum of its proper divisors (3815236422).

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

2121212304 is a wasteful number, since it uses less digits than its factorization.

2121212304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14730655 (or 14730646 counting only the distinct ones).

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

The square root of 2121212304 is about 46056.6206315661. The cubic root of 2121212304 is about 1284.8764796207.

Adding to 2121212304 its reverse (4032121212), we get a palindrome (6153333516).

The spelling of 2121212304 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, three hundred four".