243221371 has 2 divisors, whose sum is σ = 243221372. Its totient is φ = 243221370.

The previous prime is 243221359. The next prime is 243221393. The reversal of 243221371 is 173122342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243221371 - 2⁵ = 243221339 is a prime.

It is a super-2 number, since 2×243221371² = 118313270622239282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121610685 + 121610686.

It is an arithmetic number, because the mean of its divisors is an integer number (121610686).

Almost surely, 2^243221371 is an apocalyptic number.

243221371 is a deficient number, since it is larger than the sum of its proper divisors (1).

243221371 is an equidigital number, since it uses as much as digits as its factorization.

243221371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 243221371 is about 15595.5561298724. The cubic root of 243221371 is about 624.2145833265.

The spelling of 243221371 in words is "two hundred forty-three million, two hundred twenty-one thousand, three hundred seventy-one".