2121115513 has 8 divisors (see below), whose sum is σ = 2314277856. Its totient is φ = 1928008800.

The previous prime is 2121115501. The next prime is 2121115541. The reversal of 2121115513 is 3155111212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121115513 - 2²⁵ = 2087561081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121115553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138370 + ... + 152932.

It is an arithmetic number, because the mean of its divisors is an integer number (289284732).

Almost surely, 2^2121115513 is an apocalyptic number.

It is an amenable number.

2121115513 is a deficient number, since it is larger than the sum of its proper divisors (193162343).

2121115513 is a wasteful number, since it uses less digits than its factorization.

2121115513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27815.

The product of its digits is 300, while the sum is 22.

The square root of 2121115513 is about 46055.5698368829. The cubic root of 2121115513 is about 1284.8569363355.

Adding to 2121115513 its reverse (3155111212), we get a palindrome (5276226725).

The spelling of 2121115513 in words is "two billion, one hundred twenty-one million, one hundred fifteen thousand, five hundred thirteen".