221212100012 has 24 divisors (see below), whose sum is σ = 392979865152. Its totient is φ = 108943488000.

The previous prime is 221212099907. The next prime is 221212100027. The reversal of 221212100012 is 210001212122.

221212100012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221212100012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1340564 + ... + 1496507.

It is an arithmetic number, because the mean of its divisors is an integer number (16374161048).

Almost surely, 2^221212100012 is an apocalyptic number.

It is an amenable number.

221212100012 is a deficient number, since it is larger than the sum of its proper divisors (171767765140).

221212100012 is a wasteful number, since it uses less digits than its factorization.

221212100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837369 (or 2837367 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221212100012 its reverse (210001212122), we get a palindrome (431213312134).

The spelling of 221212100012 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred thousand, twelve".