12999804820 has 24 divisors (see below), whose sum is σ = 27333369000. Its totient is φ = 5193487872.

The previous prime is 12999804809. The next prime is 12999804827. The reversal of 12999804820 is 2840899921.

It can be written as a sum of positive squares in 4 ways, for example, as 1659258756 + 11340546064 = 40734^2 + 106492^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12999804827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385545 + ... + 417904.

It is an arithmetic number, because the mean of its divisors is an integer number (1138890375).

Almost surely, 2^12999804820 is an apocalyptic number.

12999804820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12999804820 is an abundant number, since it is smaller than the sum of its proper divisors (14333564180).

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

12999804820 is a wasteful number, since it uses less digits than its factorization.

12999804820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804267 (or 804265 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 12999804820 in words is "twelve billion, nine hundred ninety-nine million, eight hundred four thousand, eight hundred twenty".