221111138 has 8 divisors (see below), whose sum is σ = 343103580. Its totient is φ = 106743280.

The previous prime is 221111131. The next prime is 221111141. The reversal of 221111138 is 831111122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 220730449 + 380689 = 14857^2 + 617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221111131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906073 + ... + 1906188.

Almost surely, 2^221111138 is an apocalyptic number.

221111138 is a deficient number, since it is larger than the sum of its proper divisors (121992442).

221111138 is a wasteful number, since it uses less digits than its factorization.

221111138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812292.

The product of its digits is 96, while the sum is 20.

The square root of 221111138 is about 14869.8062529409. The cubic root of 221111138 is about 604.6956901405.

The spelling of 221111138 in words is "two hundred twenty-one million, one hundred eleven thousand, one hundred thirty-eight".