12143052821 has 2 divisors, whose sum is σ = 12143052822. Its totient is φ = 12143052820.

The previous prime is 12143052793. The next prime is 12143052833. The reversal of 12143052821 is 12825034121.

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., 9027850225 + 3115202596 = 95015^2 + 55814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12143052821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12143052871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6071526410 + 6071526411.

It is an arithmetic number, because the mean of its divisors is an integer number (6071526411).

Almost surely, 2^12143052821 is an apocalyptic number.

It is an amenable number.

12143052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12143052821 is an equidigital number, since it uses as much as digits as its factorization.

12143052821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 12143052821 its reverse (12825034121), we get a palindrome (24968086942).

The spelling of 12143052821 in words is "twelve billion, one hundred forty-three million, fifty-two thousand, eight hundred twenty-one".