152216321 has 2 divisors, whose sum is σ = 152216322. Its totient is φ = 152216320.

The previous prime is 152216291. The next prime is 152216327. The reversal of 152216321 is 123612251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147889921 + 4326400 = 12161^2 + 2080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-152216321 is a prime.

It is a super-3 number, since 3×152216321³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (152216327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76108160 + 76108161.

It is an arithmetic number, because the mean of its divisors is an integer number (76108161).

Almost surely, 2^152216321 is an apocalyptic number.

It is an amenable number.

152216321 is a deficient number, since it is larger than the sum of its proper divisors (1).

152216321 is an equidigital number, since it uses as much as digits as its factorization.

152216321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 152216321 is about 12337.5978618206. The cubic root of 152216321 is about 533.9333813662.

Adding to 152216321 its reverse (123612251), we get a palindrome (275828572).

The spelling of 152216321 in words is "one hundred fifty-two million, two hundred sixteen thousand, three hundred twenty-one".