221356 has 6 divisors (see below), whose sum is σ = 387380. Its totient is φ = 110676.

The previous prime is 221327. The next prime is 221393. The reversal of 221356 is 653122.

It is a happy number.

221356 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27666 + ... + 27673.

2²²¹³⁵⁶ is an apocalyptic number.

It is an amenable number.

221356 is a deficient number, since it is larger than the sum of its proper divisors (166024).

221356 is a wasteful number, since it uses less digits than its factorization.

221356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55343 (or 55341 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 221356 is about 470.4848562919. The cubic root of 221356 is about 60.4918824343.

Adding to 221356 its reverse (653122), we get a palindrome (874478).

It can be divided in two parts, 22 and 1356, that added together give a triangular number (1378 = T₅₂).

The spelling of 221356 in words is "two hundred twenty-one thousand, three hundred fifty-six".