13534230221 has 2 divisors, whose sum is σ = 13534230222. Its totient is φ = 13534230220.

The previous prime is 13534230217. The next prime is 13534230289. The reversal of 13534230221 is 12203243531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12557667721 + 976562500 = 112061^2 + 31250^2 .

It is a cyclic number.

It is not a de Polignac number, because 13534230221 - 2² = 13534230217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13534232221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6767115110 + 6767115111.

It is an arithmetic number, because the mean of its divisors is an integer number (6767115111).

Almost surely, 2^13534230221 is an apocalyptic number.

It is an amenable number.

13534230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13534230221 is an equidigital number, since it uses as much as digits as its factorization.

13534230221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 13534230221 its reverse (12203243531), we get a palindrome (25737473752).

The spelling of 13534230221 in words is "thirteen billion, five hundred thirty-four million, two hundred thirty thousand, two hundred twenty-one".