2015121323 has 16 divisors (see below), whose sum is σ = 2136756000. Its totient is φ = 1895104512.

The previous prime is 2015121313. The next prime is 2015121337. The reversal of 2015121323 is 3231215102.

It is a cyclic number.

It is not a de Polignac number, because 2015121323 - 2²⁴ = 1998344107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2015121295 and 2015121304.

It is not an unprimeable number, because it can be changed into a prime (2015121313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996643 + ... + 1997651.

It is an arithmetic number, because the mean of its divisors is an integer number (133547250).

Almost surely, 2^2015121323 is an apocalyptic number.

2015121323 is a deficient number, since it is larger than the sum of its proper divisors (121634677).

2015121323 is a wasteful number, since it uses less digits than its factorization.

2015121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2015121323 is about 44890.1027287753. The cubic root of 2015121323 is about 1263.0883597949.

Adding to 2015121323 its reverse (3231215102), we get a palindrome (5246336425).

The spelling of 2015121323 in words is "two billion, fifteen million, one hundred twenty-one thousand, three hundred twenty-three".