221151 has 8 divisors (see below), whose sum is σ = 337024. Its totient is φ = 126360.

The previous prime is 221101. The next prime is 221159. The reversal of 221151 is 151122.

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

It is not a de Polignac number, because 221151 - 2⁶ = 221087 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 (221159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5245 + ... + 5286.

It is an arithmetic number, because the mean of its divisors is an integer number (42128).

2²²¹¹⁵¹ is an apocalyptic number.

221151 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221151 is a deficient number, since it is larger than the sum of its proper divisors (115873).

221151 is a wasteful number, since it uses less digits than its factorization.

221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541.

The product of its digits is 20, while the sum is 12.

The square root of 221151 is about 470.2669454682. The cubic root of 221151 is about 60.4732026213.

Adding to 221151 its reverse (151122), we get a palindrome (372273).

The spelling of 221151 in words is "two hundred twenty-one thousand, one hundred fifty-one".