12820087281 has 4 divisors (see below), whose sum is σ = 17093449712. Its totient is φ = 8546724852.

The previous prime is 12820087271. The next prime is 12820087283. The reversal of 12820087281 is 18278002821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12820087281 - 2²⁹ = 12283216369 is a prime.

It is a super-2 number, since 2×12820087281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12820087283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136681211 + ... + 2136681216.

It is an arithmetic number, because the mean of its divisors is an integer number (4273362428).

Almost surely, 2^12820087281 is an apocalyptic number.

It is an amenable number.

12820087281 is a deficient number, since it is larger than the sum of its proper divisors (4273362431).

12820087281 is an equidigital number, since it uses as much as digits as its factorization.

12820087281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273362430.

The product of its (nonzero) digits is 28672, while the sum is 39.

The spelling of 12820087281 in words is "twelve billion, eight hundred twenty million, eighty-seven thousand, two hundred eighty-one".