351221 has 4 divisors (see below), whose sum is σ = 378252. Its totient is φ = 324192.

The previous prime is 351217. The next prime is 351223. The reversal of 351221 is 122153.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 130321 = 470^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 351221 - 2² = 351217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 351196 and 351205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13496 + ... + 13521.

It is an arithmetic number, because the mean of its divisors is an integer number (94563).

2³⁵¹²²¹ is an apocalyptic number.

It is an amenable number.

351221 is a deficient number, since it is larger than the sum of its proper divisors (27031).

351221 is a wasteful number, since it uses less digits than its factorization.

351221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27030.

The product of its digits is 60, while the sum is 14.

The square root of 351221 is about 592.6390132281. The cubic root of 351221 is about 70.5548422254.

Adding to 351221 its reverse (122153), we get a palindrome (473374).

The spelling of 351221 in words is "three hundred fifty-one thousand, two hundred twenty-one".