221639113 has 4 divisors (see below), whose sum is σ = 222501780. Its totient is φ = 220776448.

The previous prime is 221639107. The next prime is 221639137. The reversal of 221639113 is 311936122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219424969 + 2214144 = 14813^2 + 1488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221639113 is a prime.

It is a super-3 number, since 3×221639113³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221639513) 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, 430948 + ... + 431461.

It is an arithmetic number, because the mean of its divisors is an integer number (55625445).

Almost surely, 2^221639113 is an apocalyptic number.

It is an amenable number.

221639113 is a deficient number, since it is larger than the sum of its proper divisors (862667).

221639113 is an equidigital number, since it uses as much as digits as its factorization.

221639113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862666.

The product of its digits is 1944, while the sum is 28.

The square root of 221639113 is about 14887.5489251925. The cubic root of 221639113 is about 605.1766103248.

The spelling of 221639113 in words is "two hundred twenty-one million, six hundred thirty-nine thousand, one hundred thirteen".