12790587781021 has 4 divisors (see below), whose sum is σ = 12793907428732. Its totient is φ = 12787268133312.

The previous prime is 12790587781007. The next prime is 12790587781051. The reversal of 12790587781021 is 12018778509721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12756247984921 + 34339796100 = 3571589^2 + 185310^2 .

It is a cyclic number.

It is not a de Polignac number, because 12790587781021 - 2²³ = 12790579392413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12790587781051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1659818076 + ... + 1659825781.

It is an arithmetic number, because the mean of its divisors is an integer number (3198476857183).

Almost surely, 2^{12790587781021} is an apocalyptic number.

It is an amenable number.

12790587781021 is a deficient number, since it is larger than the sum of its proper divisors (3319647711).

12790587781021 is an equidigital number, since it uses as much as digits as its factorization.

12790587781021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319647710.

The product of its (nonzero) digits is 3951360, while the sum is 58.

The spelling of 12790587781021 in words is "twelve trillion, seven hundred ninety billion, five hundred eighty-seven million, seven hundred eighty-one thousand, twenty-one".