352220521 has 2 divisors, whose sum is σ = 352220522. Its totient is φ = 352220520.

The previous prime is 352220509. The next prime is 352220587. The reversal of 352220521 is 125022253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249482025 + 102738496 = 15795^2 + 10136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-352220521 is a prime.

It is a super-2 number, since 2×352220521² = 248118590827022882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 352220492 and 352220501.

It is not a weakly prime, because it can be changed into another prime (352220591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176110260 + 176110261.

It is an arithmetic number, because the mean of its divisors is an integer number (176110261).

Almost surely, 2^352220521 is an apocalyptic number.

It is an amenable number.

352220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

352220521 is an equidigital number, since it uses as much as digits as its factorization.

352220521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 352220521 is about 18767.5390235374. The cubic root of 352220521 is about 706.2170824870.

Adding to 352220521 its reverse (125022253), we get a palindrome (477242774).

The spelling of 352220521 in words is "three hundred fifty-two million, two hundred twenty thousand, five hundred twenty-one".