221896 has 8 divisors (see below), whose sum is σ = 416070. Its totient is φ = 110944.

The previous prime is 221891. The next prime is 221909. The reversal of 221896 is 698122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 148996 + 72900 = 386^2 + 270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

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 as a sum of consecutive naturals, namely, 13861 + ... + 13876.

2²²¹⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

221896 is a deficient number, since it is larger than the sum of its proper divisors (194174).

221896 is a wasteful number, since it uses less digits than its factorization.

221896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27743 (or 27739 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 221896 is about 471.0583827935. The cubic root of 221896 is about 60.5410326565.

The spelling of 221896 in words is "two hundred twenty-one thousand, eight hundred ninety-six".