221112012 has 72 divisors (see below), whose sum is σ = 570710448. Its totient is φ = 66577280.

The previous prime is 221111983. The next prime is 221112019. The reversal of 221112012 is 210211122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (221112019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285658 + ... + 286430.

It is an arithmetic number, because the mean of its divisors is an integer number (7926534).

Almost surely, 2^221112012 is an apocalyptic number.

221112012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221112012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285355224).

221112012 is an abundant number, since it is smaller than the sum of its proper divisors (349598436).

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

221112012 is a wasteful number, since it uses less digits than its factorization.

221112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221112012 is about 14869.8356413244. The cubic root of 221112012 is about 604.6964868791.

Adding to 221112012 its reverse (210211122), we get a palindrome (431323134).

The spelling of 221112012 in words is "two hundred twenty-one million, one hundred twelve thousand, twelve".