2031212321 has 4 divisors (see below), whose sum is σ = 2034592644. Its totient is φ = 2027832000.

The previous prime is 2031212311. The next prime is 2031212327. The reversal of 2031212321 is 1232121302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1492972321 + 538240000 = 38639^2 + 23200^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031212321 - 2⁶ = 2031212257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2031212321.

It is not an unprimeable number, because it can be changed into a prime (2031212327) 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, 1689260 + ... + 1690461.

It is an arithmetic number, because the mean of its divisors is an integer number (508648161).

Almost surely, 2^2031212321 is an apocalyptic number.

It is an amenable number.

2031212321 is a deficient number, since it is larger than the sum of its proper divisors (3380323).

2031212321 is an equidigital number, since it uses as much as digits as its factorization.

2031212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380322.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2031212321 is about 45068.9729303875. The cubic root of 2031212321 is about 1266.4414239918.

Adding to 2031212321 its reverse (1232121302), we get a palindrome (3263333623).

The spelling of 2031212321 in words is "two billion, thirty-one million, two hundred twelve thousand, three hundred twenty-one".