221802 has 16 divisors (see below), whose sum is σ = 507072. Its totient is φ = 63360.

The previous prime is 221797. The next prime is 221807. The reversal of 221802 is 208122.

221802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221797) and next prime (221807).

It is a super-2 number, since 2×221802² = 98392254408, which contains 22 as substring.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221802.

It is not an unprimeable number, because it can be changed into a prime (221807) by changing a digit.

221802 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2599 + ... + 2682.

It is an arithmetic number, because the mean of its divisors is an integer number (31692).

2²²¹⁸⁰² is an apocalyptic number.

221802 is an abundant number, since it is smaller than the sum of its proper divisors (285270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221802 is a wasteful number, since it uses less digits than its factorization.

221802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221802 is about 470.9585969064. The cubic root of 221802 is about 60.5324826138.

Adding to 221802 its reverse (208122), we get a palindrome (429924).

The spelling of 221802 in words is "two hundred twenty-one thousand, eight hundred two".