221012118 has 32 divisors (see below), whose sum is σ = 492069600. Its totient is φ = 73531008.

The previous prime is 221012111. The next prime is 221012119. The reversal of 221012118 is 811210122.

221012118 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221012118.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 27130 + ... + 34322.

It is an arithmetic number, because the mean of its divisors is an integer number (15377175).

Almost surely, 2^221012118 is an apocalyptic number.

221012118 is an abundant number, since it is smaller than the sum of its proper divisors (271057482).

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

221012118 is a wasteful number, since it uses less digits than its factorization.

221012118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7773 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 221012118 is about 14866.4763141775. The cubic root of 221012118 is about 604.6054098886.

The spelling of 221012118 in words is "two hundred twenty-one million, twelve thousand, one hundred eighteen".