221221000012 has 12 divisors (see below), whose sum is σ = 387166106880. Its totient is φ = 110602112336.

The previous prime is 221221000009. The next prime is 221221000037. The reversal of 221221000012 is 210000122122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221220999956 and 221221000001.

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 3 ways as a sum of consecutive naturals, for example, 2037388 + ... + 2143219.

It is an arithmetic number, because the mean of its divisors is an integer number (32263842240).

Almost surely, 2^221221000012 is an apocalyptic number.

It is an amenable number.

221221000012 is a deficient number, since it is larger than the sum of its proper divisors (165945106868).

221221000012 is a wasteful number, since it uses less digits than its factorization.

221221000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4193840 (or 4193838 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221221000012 its reverse (210000122122), we get a palindrome (431221122134).

The spelling of 221221000012 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve", and thus it is an aban number.