12820851072 has 96 divisors (see below), whose sum is σ = 38259847080. Its totient is φ = 4273606656.

The previous prime is 12820851031. The next prime is 12820851089. The reversal of 12820851072 is 27015802821.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174993 + ... + 237200.

Almost surely, 2^12820851072 is an apocalyptic number.

12820851072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12820851072 is an abundant number, since it is smaller than the sum of its proper divisors (25438996008).

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

12820851072 is an frugal number, since it uses more digits than its factorization.

12820851072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412222 (or 412198 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The spelling of 12820851072 in words is "twelve billion, eight hundred twenty million, eight hundred fifty-one thousand, seventy-two".