12821581266 has 16 divisors (see below), whose sum is σ = 27615713664. Its totient is φ = 3945101904.

The previous prime is 12821581229. The next prime is 12821581313. The reversal of 12821581266 is 66218512821.

It is a super-3 number, since 3×12821581266³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82189546 + ... + 82189701.

It is an arithmetic number, because the mean of its divisors is an integer number (1725982104).

Almost surely, 2^12821581266 is an apocalyptic number.

12821581266 is an abundant number, since it is smaller than the sum of its proper divisors (14794132398).

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

12821581266 is a wasteful number, since it uses less digits than its factorization.

12821581266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164379265.

The product of its digits is 92160, while the sum is 42.

The spelling of 12821581266 in words is "twelve billion, eight hundred twenty-one million, five hundred eighty-one thousand, two hundred sixty-six".