134240221 has 2 divisors, whose sum is σ = 134240222. Its totient is φ = 134240220.

The previous prime is 134240219. The next prime is 134240231. The reversal of 134240221 is 122042431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78960996 + 55279225 = 8886^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 134240221 - 2¹ = 134240219 is a prime.

Together with 134240219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134240231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67120110 + 67120111.

It is an arithmetic number, because the mean of its divisors is an integer number (67120111).

Almost surely, 2^134240221 is an apocalyptic number.

It is an amenable number.

134240221 is a deficient number, since it is larger than the sum of its proper divisors (1).

134240221 is an equidigital number, since it uses as much as digits as its factorization.

134240221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 134240221 is about 11586.2082235734. The cubic root of 134240221 is about 512.0285997310.

Adding to 134240221 its reverse (122042431), we get a palindrome (256282652).

The spelling of 134240221 in words is "one hundred thirty-four million, two hundred forty thousand, two hundred twenty-one".