12840816220 has 24 divisors (see below), whose sum is σ = 26995482864. Its totient is φ = 5130656256.

The previous prime is 12840816161. The next prime is 12840816221. The reversal of 12840816220 is 2261804821.

It is a super-2 number, since 2×12840816220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840816221) 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, 335797 + ... + 372076.

It is an arithmetic number, because the mean of its divisors is an integer number (1124811786).

Almost surely, 2^12840816220 is an apocalyptic number.

12840816220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12840816220 is an abundant number, since it is smaller than the sum of its proper divisors (14154666644).

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

12840816220 is a wasteful number, since it uses less digits than its factorization.

12840816220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708789 (or 708787 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 12840816220 in words is "twelve billion, eight hundred forty million, eight hundred sixteen thousand, two hundred twenty".