352721521 has 2 divisors, whose sum is σ = 352721522. Its totient is φ = 352721520.

The previous prime is 352721497. The next prime is 352721549. The reversal of 352721521 is 125127253.

It is an a-pointer prime, because the next prime (352721549) can be obtained adding 352721521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350438400 + 2283121 = 18720^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 352721521 - 2⁹ = 352721009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 352721521.

It is not a weakly prime, because it can be changed into another prime (352721821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176360760 + 176360761.

It is an arithmetic number, because the mean of its divisors is an integer number (176360761).

Almost surely, 2^352721521 is an apocalyptic number.

It is an amenable number.

352721521 is a deficient number, since it is larger than the sum of its proper divisors (1).

352721521 is an equidigital number, since it uses as much as digits as its factorization.

352721521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 352721521 is about 18780.8817950596. The cubic root of 352721521 is about 706.5517659346.

Adding to 352721521 its reverse (125127253), we get a palindrome (477848774).

The spelling of 352721521 in words is "three hundred fifty-two million, seven hundred twenty-one thousand, five hundred twenty-one".