2121811215 has 32 divisors (see below), whose sum is σ = 3448935936. Its totient is φ = 1113678720.

The previous prime is 2121811207. The next prime is 2121811243. The reversal of 2121811215 is 5121181212.

It is not a de Polignac number, because 2121811215 - 2³ = 2121811207 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 725937 + ... + 728853.

It is an arithmetic number, because the mean of its divisors is an integer number (107779248).

Almost surely, 2^2121811215 is an apocalyptic number.

2121811215 is a deficient number, since it is larger than the sum of its proper divisors (1327124721).

2121811215 is a wasteful number, since it uses less digits than its factorization.

2121811215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679.

The product of its digits is 320, while the sum is 24.

The square root of 2121811215 is about 46063.1220717832. The cubic root of 2121811215 is about 1284.9973938488.

Adding to 2121811215 its reverse (5121181212), we get a palindrome (7242992427).

The spelling of 2121811215 in words is "two billion, one hundred twenty-one million, eight hundred eleven thousand, two hundred fifteen".