221632151 has 8 divisors (see below), whose sum is σ = 238991424. Its totient is φ = 204317280.

The previous prime is 221632141. The next prime is 221632171. The reversal of 221632151 is 151236122.

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

It is a cyclic number.

It is not a de Polignac number, because 221632151 - 2¹⁰ = 221631127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221632121) by changing a digit.

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, 335 + ... + 21056.

It is an arithmetic number, because the mean of its divisors is an integer number (29873928).

Almost surely, 2^221632151 is an apocalyptic number.

221632151 is a deficient number, since it is larger than the sum of its proper divisors (17359273).

221632151 is a wasteful number, since it uses less digits than its factorization.

221632151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22201.

The product of its digits is 720, while the sum is 23.

The square root of 221632151 is about 14887.3151038057. The cubic root of 221632151 is about 605.1702737723.

Adding to 221632151 its reverse (151236122), we get a palindrome (372868273).

The spelling of 221632151 in words is "two hundred twenty-one million, six hundred thirty-two thousand, one hundred fifty-one".