2221212516 has 24 divisors (see below), whose sum is σ = 5241065760. Its totient is φ = 732084672.

The previous prime is 2221212491. The next prime is 2221212577. The reversal of 2221212516 is 6152121222.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038826 + ... + 1040961.

It is an arithmetic number, because the mean of its divisors is an integer number (218377740).

Almost surely, 2^2221212516 is an apocalyptic number.

It is an amenable number.

2221212516 is an abundant number, since it is smaller than the sum of its proper divisors (3019853244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221212516 is a wasteful number, since it uses less digits than its factorization.

2221212516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079883 (or 2079881 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 2221212516 is about 47129.7413105568. The cubic root of 2221212516 is about 1304.7582071370.

Adding to 2221212516 its reverse (6152121222), we get a palindrome (8373333738).

The spelling of 2221212516 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, five hundred sixteen".