221895 has 12 divisors (see below), whose sum is σ = 384696. Its totient is φ = 118320.

The previous prime is 221891. The next prime is 221909. The reversal of 221895 is 598122.

It is not a de Polignac number, because 221895 - 2² = 221891 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2421 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (32058).

2²²¹⁸⁹⁵ is an apocalyptic number.

221895 is a deficient number, since it is larger than the sum of its proper divisors (162801).

221895 is a wasteful number, since it uses less digits than its factorization.

221895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942 (or 4939 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 221895 is about 471.0573213527. The cubic root of 221895 is about 60.5409417113.

The spelling of 221895 in words is "two hundred twenty-one thousand, eight hundred ninety-five".