2005121115 has 32 divisors (see below), whose sum is σ = 3568119360. Its totient is φ = 1068360192.

The previous prime is 2005121101. The next prime is 2005121119. The reversal of 2005121115 is 5111215002.

It is not a de Polignac number, because 2005121115 - 2⁴ = 2005121099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005121119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144147 + ... + 157443.

It is an arithmetic number, because the mean of its divisors is an integer number (111503730).

Almost surely, 2^2005121115 is an apocalyptic number.

2005121115 is a deficient number, since it is larger than the sum of its proper divisors (1562998245).

2005121115 is a wasteful number, since it uses less digits than its factorization.

2005121115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14428 (or 14422 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 2005121115 is about 44778.5787514521. The cubic root of 2005121115 is about 1260.9955001167.

Adding to 2005121115 its reverse (5111215002), we get a palindrome (7116336117).

The spelling of 2005121115 in words is "two billion, five million, one hundred twenty-one thousand, one hundred fifteen".