221110121212 has 24 divisors (see below), whose sum is σ = 391670269200. Its totient is φ = 109204776576.

The previous prime is 221110121209. The next prime is 221110121261. The reversal of 221110121212 is 212121011122.

It is a congruent number.

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, 2048614 + ... + 2153842.

It is an arithmetic number, because the mean of its divisors is an integer number (16319594550).

Almost surely, 2^221110121212 is an apocalyptic number.

It is an amenable number.

221110121212 is a deficient number, since it is larger than the sum of its proper divisors (170560147988).

221110121212 is a wasteful number, since it uses less digits than its factorization.

221110121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111645 (or 111643 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221110121212 its reverse (212121011122), we get a palindrome (433231132334).

The spelling of 221110121212 in words is "two hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred twelve".