221221220012 has 48 divisors (see below), whose sum is σ = 417733348032. Its totient is φ = 101902406400.

The previous prime is 221221219987. The next prime is 221221220021. The reversal of 221221220012 is 210022122122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86718137 + ... + 86720687.

It is an arithmetic number, because the mean of its divisors is an integer number (8702778084).

Almost surely, 2^221221220012 is an apocalyptic number.

It is an amenable number.

221221220012 is a deficient number, since it is larger than the sum of its proper divisors (196512128020).

221221220012 is a wasteful number, since it uses less digits than its factorization.

221221220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178 (or 5176 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221221220012 its reverse (210022122122), we get a palindrome (431243342134).

The spelling of 221221220012 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, twelve".