252218321 has 2 divisors, whose sum is σ = 252218322. Its totient is φ = 252218320.

The previous prime is 252218303. The next prime is 252218327. The reversal of 252218321 is 123812252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212022721 + 40195600 = 14561^2 + 6340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252218321 is a prime.

It is a super-2 number, since 2×252218321² = 127228162896118082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (252218327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126109160 + 126109161.

It is an arithmetic number, because the mean of its divisors is an integer number (126109161).

Almost surely, 2^252218321 is an apocalyptic number.

It is an amenable number.

252218321 is a deficient number, since it is larger than the sum of its proper divisors (1).

252218321 is an equidigital number, since it uses as much as digits as its factorization.

252218321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 252218321 is about 15881.3828428132. The cubic root of 252218321 is about 631.8183137211.

The spelling of 252218321 in words is "two hundred fifty-two million, two hundred eighteen thousand, three hundred twenty-one".