2121212320 has 24 divisors (see below), whose sum is σ = 5011364484. Its totient is φ = 848484864.

The previous prime is 2121212311. The next prime is 2121212321. The reversal of 2121212320 is 232121212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2103873424 + 17338896 = 45868^2 + 4164^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 2121212294 and 2121212303.

It is not an unprimeable number, because it can be changed into a prime (2121212321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6628629 + ... + 6628948.

Almost surely, 2^2121212320 is an apocalyptic number.

2121212320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121212320 is an abundant number, since it is smaller than the sum of its proper divisors (2890152164).

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

2121212320 is a wasteful number, since it uses less digits than its factorization.

2121212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13257592 (or 13257584 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2121212320 is about 46056.6208052653. The cubic root of 2121212320 is about 1284.8764828512.

Adding to 2121212320 its reverse (232121212), we get a palindrome (2353333532).

The spelling of 2121212320 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty".