12821027994 has 12 divisors (see below), whose sum is σ = 27778894026. Its totient is φ = 4273675992.

The previous prime is 12821027987. The next prime is 12821028001. The reversal of 12821027994 is 49972012821.

12821027994 is a `hidden beast` number, since 1 + 282 + 10 + 279 + 94 = 666.

It is an interprime number because it is at equal distance from previous prime (12821027987) and next prime (12821028001).

It can be written as a sum of positive squares in only one way, i.e., 8443220769 + 4377807225 = 91887^2 + 66165^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 356139649 + ... + 356139684.

Almost surely, 2^12821027994 is an apocalyptic number.

12821027994 is an abundant number, since it is smaller than the sum of its proper divisors (14957866032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12821027994 is a wasteful number, since it uses less digits than its factorization.

12821027994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712279341 (or 712279338 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 12821027994 in words is "twelve billion, eight hundred twenty-one million, twenty-seven thousand, nine hundred ninety-four".