221424331 has 2 divisors, whose sum is σ = 221424332. Its totient is φ = 221424330.

The previous prime is 221424319. The next prime is 221424341. The reversal of 221424331 is 133424122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221424331 - 2¹¹ = 221422283 is a prime.

It is a super-2 number, since 2×221424331² = 98057468717595122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221424341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110712165 + 110712166.

It is an arithmetic number, because the mean of its divisors is an integer number (110712166).

Almost surely, 2^221424331 is an apocalyptic number.

221424331 is a deficient number, since it is larger than the sum of its proper divisors (1).

221424331 is an equidigital number, since it uses as much as digits as its factorization.

221424331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 221424331 is about 14880.3336992152. Note that the first 3 decimals coincide. The cubic root of 221424331 is about 604.9810626315.

Adding to 221424331 its reverse (133424122), we get a palindrome (354848453).

The spelling of 221424331 in words is "two hundred twenty-one million, four hundred twenty-four thousand, three hundred thirty-one".