308347516821 has 16 divisors (see below), whose sum is σ = 426737013248. Its totient is φ = 197834788800.

The previous prime is 308347516793. The next prime is 308347516823. The reversal of 308347516821 is 128615743803.

It is not a de Polignac number, because 308347516821 - 2¹⁹ = 308346992533 is a prime.

It is a super-2 number, since 2×308347516821² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308347516823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9142186 + ... + 9175851.

It is an arithmetic number, because the mean of its divisors is an integer number (26671063328).

Almost surely, 2^308347516821 is an apocalyptic number.

308347516821 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

308347516821 is a deficient number, since it is larger than the sum of its proper divisors (118389496427).

308347516821 is a wasteful number, since it uses less digits than its factorization.

308347516821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318252.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 308347516821 in words is "three hundred eight billion, three hundred forty-seven million, five hundred sixteen thousand, eight hundred twenty-one".