221122212012 has 120 divisors (see below), whose sum is σ = 623369747616. Its totient is φ = 67945070592.

The previous prime is 221122211987. The next prime is 221122212049. The reversal of 221122212012 is 210212221122.

It is a happy number.

It is a super-3 number, since 3×221122212012³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3094188 + ... + 3164844.

Almost surely, 2^221122212012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221122212012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311684873808).

221122212012 is an abundant number, since it is smaller than the sum of its proper divisors (402247535604).

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

221122212012 is a wasteful number, since it uses less digits than its factorization.

221122212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71429 (or 71418 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221122212012 its reverse (210212221122), we get a palindrome (431334433134).

The spelling of 221122212012 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, twelve".