221881 has 8 divisors (see below), whose sum is σ = 252864. Its totient is φ = 192720.

The previous prime is 221873. The next prime is 221891. The reversal of 221881 is 188122.

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

It is not a de Polignac number, because 221881 - 2³ = 221873 is a prime.

It is a super-2 number, since 2×221881² = 98462356322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221831) 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, 186 + ... + 691.

It is an arithmetic number, because the mean of its divisors is an integer number (31608).

2²²¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

221881 is a deficient number, since it is larger than the sum of its proper divisors (30983).

221881 is a wasteful number, since it uses less digits than its factorization.

221881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its digits is 256, while the sum is 22.

The square root of 221881 is about 471.0424609311. The cubic root of 221881 is about 60.5396684499.

The spelling of 221881 in words is "two hundred twenty-one thousand, eight hundred eighty-one".