356221 has 4 divisors (see below), whose sum is σ = 367744. Its totient is φ = 344700.

The previous prime is 356219. The next prime is 356243. The reversal of 356221 is 122653.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 356221 - 2¹ = 356219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (356261) 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, 5715 + ... + 5776.

It is an arithmetic number, because the mean of its divisors is an integer number (91936).

2³⁵⁶²²¹ is an apocalyptic number.

356221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

356221 is a deficient number, since it is larger than the sum of its proper divisors (11523).

356221 is a wasteful number, since it uses less digits than its factorization.

356221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11522.

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

The square root of 356221 is about 596.8425252946. The cubic root of 356221 is about 70.8880733339. Note that the first 3 decimals are identical.

Adding to 356221 its reverse (122653), we get a palindrome (478874).

The spelling of 356221 in words is "three hundred fifty-six thousand, two hundred twenty-one".