221222001012 has 12 divisors (see below), whose sum is σ = 516184669056. Its totient is φ = 73740667000.

The previous prime is 221222000983. The next prime is 221222001017. The reversal of 221222001012 is 210100222122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221222000982 and 221222001000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222001017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9217583364 + ... + 9217583387.

It is an arithmetic number, because the mean of its divisors is an integer number (43015389088).

Almost surely, 2^221222001012 is an apocalyptic number.

It is an amenable number.

221222001012 is an abundant number, since it is smaller than the sum of its proper divisors (294962668044).

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

221222001012 is a wasteful number, since it uses less digits than its factorization.

221222001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18435166758 (or 18435166756 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221222001012 its reverse (210100222122), we get a palindrome (431322223134).

The spelling of 221222001012 in words is "two hundred twenty-one billion, two hundred twenty-two million, one thousand, twelve".