12453252221 has 2 divisors, whose sum is σ = 12453252222. Its totient is φ = 12453252220.

The previous prime is 12453252209. The next prime is 12453252271. The reversal of 12453252221 is 12225235421.

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., 8099100025 + 4354152196 = 89995^2 + 65986^2 .

It is a cyclic number.

It is not a de Polignac number, because 12453252221 - 2⁶ = 12453252157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12453252271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6226626110 + 6226626111.

It is an arithmetic number, because the mean of its divisors is an integer number (6226626111).

Almost surely, 2^12453252221 is an apocalyptic number.

It is an amenable number.

12453252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12453252221 is an equidigital number, since it uses as much as digits as its factorization.

12453252221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

Adding to 12453252221 its reverse (12225235421), we get a palindrome (24678487642).

The spelling of 12453252221 in words is "twelve billion, four hundred fifty-three million, two hundred fifty-two thousand, two hundred twenty-one".