129822831821 has 2 divisors, whose sum is σ = 129822831822. Its totient is φ = 129822831820.

The previous prime is 129822831797. The next prime is 129822831823. The reversal of 129822831821 is 128138228921.

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., 119120929321 + 10701902500 = 345139^2 + 103450^2 .

It is an emirp because it is prime and its reverse (128138228921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129822831821 is a prime.

Together with 129822831823, 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 (129822831823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64911415910 + 64911415911.

It is an arithmetic number, because the mean of its divisors is an integer number (64911415911).

Almost surely, 2^129822831821 is an apocalyptic number.

It is an amenable number.

129822831821 is a deficient number, since it is larger than the sum of its proper divisors (1).

129822831821 is an equidigital number, since it uses as much as digits as its factorization.

129822831821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 47.

The spelling of 129822831821 in words is "one hundred twenty-nine billion, eight hundred twenty-two million, eight hundred thirty-one thousand, eight hundred twenty-one".