221722 has 8 divisors (see below), whose sum is σ = 338400. Its totient is φ = 108924.

The previous prime is 221719. The next prime is 221723. The reversal of 221722 is 227122.

221722 is nontrivially palindromic in base 12.

221722 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 221696 and 221705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (42300).

2²²¹⁷²² is an apocalyptic number.

221722 is a deficient number, since it is larger than the sum of its proper divisors (116678).

221722 is a wasteful number, since it uses less digits than its factorization.

221722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940.

The product of its digits is 112, while the sum is 16.

The square root of 221722 is about 470.8736560905. The cubic root of 221722 is about 60.5252040787.

Adding to 221722 its reverse (227122), we get a palindrome (448844).

It can be divided in two parts, 22172 and 2, that multiplied together give a palindrome (44344).

The spelling of 221722 in words is "two hundred twenty-one thousand, seven hundred twenty-two", and thus it is an iban number.