221531341 has 2 divisors, whose sum is σ = 221531342. Its totient is φ = 221531340.

The previous prime is 221531309. The next prime is 221531347. The reversal of 221531341 is 143135122.

It is a happy number.

221531341 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218182441 + 3348900 = 14771^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 221531341 - 2⁵ = 221531309 is a prime.

It is a super-2 number, since 2×221531341² = 98152270090516562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221531347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110765670 + 110765671.

It is an arithmetic number, because the mean of its divisors is an integer number (110765671).

Almost surely, 2^221531341 is an apocalyptic number.

It is an amenable number.

221531341 is a deficient number, since it is larger than the sum of its proper divisors (1).

221531341 is an equidigital number, since it uses as much as digits as its factorization.

221531341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 221531341 is about 14883.9289503813. The cubic root of 221531341 is about 605.0785053967.

Adding to 221531341 its reverse (143135122), we get a palindrome (364666463).

The spelling of 221531341 in words is "two hundred twenty-one million, five hundred thirty-one thousand, three hundred forty-one".