99829157821 has 2 divisors, whose sum is σ = 99829157822. Its totient is φ = 99829157820.

The previous prime is 99829157807. The next prime is 99829157833. The reversal of 99829157821 is 12875192899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73370556900 + 26458600921 = 270870^2 + 162661^2 .

It is an emirp because it is prime and its reverse (12875192899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99829157821 - 2⁷ = 99829157693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99829157821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99829157801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49914578910 + 49914578911.

It is an arithmetic number, because the mean of its divisors is an integer number (49914578911).

Almost surely, 2^99829157821 is an apocalyptic number.

It is an amenable number.

99829157821 is a deficient number, since it is larger than the sum of its proper divisors (1).

99829157821 is an equidigital number, since it uses as much as digits as its factorization.

99829157821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 61.

The spelling of 99829157821 in words is "ninety-nine billion, eight hundred twenty-nine million, one hundred fifty-seven thousand, eight hundred twenty-one".