221433427 has 2 divisors, whose sum is σ = 221433428. Its totient is φ = 221433426.

The previous prime is 221433389. The next prime is 221433437. The reversal of 221433427 is 724334122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221433427 - 2²⁷ = 87215699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221433395 and 221433404.

It is not a weakly prime, because it can be changed into another prime (221433437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110716713 + 110716714.

It is an arithmetic number, because the mean of its divisors is an integer number (110716714).

Almost surely, 2^221433427 is an apocalyptic number.

221433427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221433427 is an equidigital number, since it uses as much as digits as its factorization.

221433427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 28.

The square root of 221433427 is about 14880.6393343835. The cubic root of 221433427 is about 604.9893466239.

Adding to 221433427 its reverse (724334122), we get a palindrome (945767549).

The spelling of 221433427 in words is "two hundred twenty-one million, four hundred thirty-three thousand, four hundred twenty-seven".