134442221 has 2 divisors, whose sum is σ = 134442222. Its totient is φ = 134442220.

The previous prime is 134442197. The next prime is 134442223. The reversal of 134442221 is 122244431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94575625 + 39866596 = 9725^2 + 6314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134442221 is a prime.

Together with 134442223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134442223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67221110 + 67221111.

It is an arithmetic number, because the mean of its divisors is an integer number (67221111).

Almost surely, 2^134442221 is an apocalyptic number.

It is an amenable number.

134442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

134442221 is an equidigital number, since it uses as much as digits as its factorization.

134442221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 23.

The square root of 134442221 is about 11594.9222075873. The cubic root of 134442221 is about 512.2852986064.

Adding to 134442221 its reverse (122244431), we get a palindrome (256686652).

The spelling of 134442221 in words is "one hundred thirty-four million, four hundred forty-two thousand, two hundred twenty-one".