221012112 has 40 divisors (see below), whose sum is σ = 580632480. Its totient is φ = 72421120.

The previous prime is 221012111. The next prime is 221012119. The reversal of 221012112 is 211210122.

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 (221012111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36189 + ... + 41852.

It is an arithmetic number, because the mean of its divisors is an integer number (14515812).

Almost surely, 2^221012112 is an apocalyptic number.

It is an amenable number.

221012112 is an abundant number, since it is smaller than the sum of its proper divisors (359620368).

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

221012112 is a wasteful number, since it uses less digits than its factorization.

221012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78111 (or 78105 counting only the distinct ones).

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

The square root of 221012112 is about 14866.4761123812. The cubic root of 221012112 is about 604.6054044174.

Adding to 221012112 its reverse (211210122), we get a palindrome (432222234).

The spelling of 221012112 in words is "two hundred twenty-one million, twelve thousand, one hundred twelve".