357221 has 4 divisors (see below), whose sum is σ = 378252. Its totient is φ = 336192.

The previous prime is 357211. The next prime is 357229. The reversal of 357221 is 122753.

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 96100 + 261121 = 310^2 + 511^2 .

It is not a de Polignac number, because 357221 - 2¹⁰ = 356197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 357193 and 357202.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 357221.

It is not an unprimeable number, because it can be changed into a prime (357229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10490 + ... + 10523.

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

2³⁵⁷²²¹ is an apocalyptic number.

It is an amenable number.

357221 is a deficient number, since it is larger than the sum of its proper divisors (21031).

357221 is a wasteful number, since it uses less digits than its factorization.

357221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21030.

The product of its digits is 420, while the sum is 20.

The square root of 357221 is about 597.6796800963. The cubic root of 357221 is about 70.9543447807.

Adding to 357221 its reverse (122753), we get a palindrome (479974).

The spelling of 357221 in words is "three hundred fifty-seven thousand, two hundred twenty-one".