135224540221 has 2 divisors, whose sum is σ = 135224540222. Its totient is φ = 135224540220.

The previous prime is 135224540177. The next prime is 135224540237. The reversal of 135224540221 is 122045422531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130403320996 + 4821219225 = 361114^2 + 69435^2 .

It is a cyclic number.

It is not a de Polignac number, because 135224540221 - 2¹⁷ = 135224409149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135224543221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67612270110 + 67612270111.

It is an arithmetic number, because the mean of its divisors is an integer number (67612270111).

Almost surely, 2^135224540221 is an apocalyptic number.

It is an amenable number.

135224540221 is a deficient number, since it is larger than the sum of its proper divisors (1).

135224540221 is an equidigital number, since it uses as much as digits as its factorization.

135224540221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 135224540221 its reverse (122045422531), we get a palindrome (257269962752).

The spelling of 135224540221 in words is "one hundred thirty-five billion, two hundred twenty-four million, five hundred forty thousand, two hundred twenty-one".