308318112516821 has 48 divisors (see below), whose sum is σ = 365925485787840. Its totient is φ = 257496215808000.

The previous prime is 308318112516809. The next prime is 308318112516823. The reversal of 308318112516821 is 128615211813803.

It is not a de Polignac number, because 308318112516821 - 2¹⁰ = 308318112515797 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 308318112516821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308318112516823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19334945 + ... + 31471833.

It is an arithmetic number, because the mean of its divisors is an integer number (7623447620580).

Almost surely, 2^{308318112516821} is an apocalyptic number.

It is an amenable number.

308318112516821 is a deficient number, since it is larger than the sum of its proper divisors (57607373271019).

308318112516821 is a wasteful number, since it uses less digits than its factorization.

308318112516821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12137126 (or 12137109 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 308318112516821 in words is "three hundred eight trillion, three hundred eighteen billion, one hundred twelve million, five hundred sixteen thousand, eight hundred twenty-one".