221601115 has 8 divisors (see below), whose sum is σ = 266033088. Its totient is φ = 177206400.

The previous prime is 221601097. The next prime is 221601131. The reversal of 221601115 is 511106122.

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

It is not a de Polignac number, because 221601115 - 2⁷ = 221600987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221601092 and 221601101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6094 + ... + 21916.

It is an arithmetic number, because the mean of its divisors is an integer number (33254136).

Almost surely, 2^221601115 is an apocalyptic number.

221601115 is a deficient number, since it is larger than the sum of its proper divisors (44431973).

221601115 is a wasteful number, since it uses less digits than its factorization.

221601115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18629.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 221601115 is about 14886.2727034003. The cubic root of 221601115 is about 605.1420243489.

Adding to 221601115 its reverse (511106122), we get a palindrome (732707237).

The spelling of 221601115 in words is "two hundred twenty-one million, six hundred one thousand, one hundred fifteen".