2013240121 has 4 divisors (see below), whose sum is σ = 2023459812. Its totient is φ = 2003020432.

The previous prime is 2013240077. The next prime is 2013240143. The reversal of 2013240121 is 1210423102.

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 1116896400 + 896343721 = 33420^2 + 29939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2013240121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2013240095 and 2013240104.

It is not an unprimeable number, because it can be changed into a prime (2013240721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5109550 + ... + 5109943.

It is an arithmetic number, because the mean of its divisors is an integer number (505864953).

Almost surely, 2^2013240121 is an apocalyptic number.

It is an amenable number.

2013240121 is a deficient number, since it is larger than the sum of its proper divisors (10219691).

2013240121 is a wasteful number, since it uses less digits than its factorization.

2013240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219690.

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

The square root of 2013240121 is about 44869.1444201915. The cubic root of 2013240121 is about 1262.6951884078.

Adding to 2013240121 its reverse (1210423102), we get a palindrome (3223663223).

The spelling of 2013240121 in words is "two billion, thirteen million, two hundred forty thousand, one hundred twenty-one".