221344031 has 2 divisors, whose sum is σ = 221344032. Its totient is φ = 221344030.

The previous prime is 221344007. The next prime is 221344043. The reversal of 221344031 is 130443122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221344031 - 2¹⁴ = 221327647 is a prime.

It is a super-2 number, since 2×221344031² = 97986360118657922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221343994 and 221344012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221344001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110672015 + 110672016.

It is an arithmetic number, because the mean of its divisors is an integer number (110672016).

Almost surely, 2^221344031 is an apocalyptic number.

221344031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221344031 is an equidigital number, since it uses as much as digits as its factorization.

221344031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221344031 is about 14877.6352623661. The cubic root of 221344031 is about 604.9079212370.

Adding to 221344031 its reverse (130443122), we get a palindrome (351787153).

Subtracting from 221344031 its reverse (130443122), we obtain a palindrome (90900909).

The spelling of 221344031 in words is "two hundred twenty-one million, three hundred forty-four thousand, thirty-one".