12221221112012 has 18 divisors (see below), whose sum is σ = 23508175321764. Its totient is φ = 5555100505240.

The previous prime is 12221221112011. The next prime is 12221221112039. The reversal of 12221221112012 is 21021112212221.

It is not an unprimeable number, because it can be changed into a prime (12221221112011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12625227938 + ... + 12625228905.

It is an arithmetic number, because the mean of its divisors is an integer number (1306009740098).

Almost surely, 2^{12221221112012} is an apocalyptic number.

It is an amenable number.

12221221112012 is a deficient number, since it is larger than the sum of its proper divisors (11286954209752).

12221221112012 is a wasteful number, since it uses less digits than its factorization.

12221221112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25250456869 (or 25250456856 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12221221112012 its reverse (21021112212221), we get a palindrome (33242333324233).

The spelling of 12221221112012 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, twelve".