221022111212 has 48 divisors (see below), whose sum is σ = 448882560000. Its totient is φ = 93267318144.

The previous prime is 221022111181. The next prime is 221022111341. The reversal of 221022111212 is 212111220122.

221022111212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221022111212³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410039 + ... + 781137.

It is an arithmetic number, because the mean of its divisors is an integer number (9351720000).

Almost surely, 2^221022111212 is an apocalyptic number.

It is an amenable number.

221022111212 is an abundant number, since it is smaller than the sum of its proper divisors (227860448788).

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

221022111212 is a wasteful number, since it uses less digits than its factorization.

221022111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371438 (or 371436 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221022111212 its reverse (212111220122), we get a palindrome (433133331334).

The spelling of 221022111212 in words is "two hundred twenty-one billion, twenty-two million, one hundred eleven thousand, two hundred twelve".