2121312323 has 16 divisors (see below), whose sum is σ = 2419173120. Its totient is φ = 1843930656.

The previous prime is 2121312313. The next prime is 2121312331. The reversal of 2121312323 is 3232131212.

It is a cyclic number.

It is not a de Polignac number, because 2121312323 - 2⁴ = 2121312307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121312295 and 2121312304.

It is not an unprimeable number, because it can be changed into a prime (2121312313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15536 + ... + 66962.

It is an arithmetic number, because the mean of its divisors is an integer number (151198320).

Almost surely, 2^2121312323 is an apocalyptic number.

2121312323 is a deficient number, since it is larger than the sum of its proper divisors (297860797).

2121312323 is a wasteful number, since it uses less digits than its factorization.

2121312323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51626.

The product of its digits is 432, while the sum is 20.

The square root of 2121312323 is about 46057.7064452845. The cubic root of 2121312323 is about 1284.8966740539.

Adding to 2121312323 its reverse (3232131212), we get a palindrome (5353443535).

The spelling of 2121312323 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, three hundred twenty-three".