221111220012 has 24 divisors (see below), whose sum is σ = 533716738800. Its totient is φ = 71162231616.

The previous prime is 221111219971. The next prime is 221111220013. The reversal of 221111220012 is 210022111122.

It is a junction number, because it is equal to n+sod(n) for n = 221111219973 and 221111220000.

It is not an unprimeable number, because it can be changed into a prime (221111220013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317688187 + ... + 317688882.

It is an arithmetic number, because the mean of its divisors is an integer number (22238197450).

Almost surely, 2^221111220012 is an apocalyptic number.

It is an amenable number.

221111220012 is an abundant number, since it is smaller than the sum of its proper divisors (312605518788).

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

221111220012 is a wasteful number, since it uses less digits than its factorization.

221111220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635377105 (or 635377103 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221111220012 its reverse (210022111122), we get a palindrome (431133331134).

The spelling of 221111220012 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, twelve".