352220321 has 4 divisors (see below), whose sum is σ = 367534272. Its totient is φ = 336906372.

The previous prime is 352220317. The next prime is 352220327. The reversal of 352220321 is 123022253.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123022253 = 193 ⋅637421.

It is a cyclic number.

It is not a de Polignac number, because 352220321 - 2² = 352220317 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 = 352220293 and 352220302.

It is not an unprimeable number, because it can be changed into a prime (352220327) 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, 7656941 + ... + 7656986.

It is an arithmetic number, because the mean of its divisors is an integer number (91883568).

Almost surely, 2^352220321 is an apocalyptic number.

It is an amenable number.

352220321 is a deficient number, since it is larger than the sum of its proper divisors (15313951).

352220321 is a wasteful number, since it uses less digits than its factorization.

352220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15313950.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 352220321 is about 18767.5336951875. The cubic root of 352220321 is about 706.2169488175.

Adding to 352220321 its reverse (123022253), we get a palindrome (475242574).

The spelling of 352220321 in words is "three hundred fifty-two million, two hundred twenty thousand, three hundred twenty-one".