12787813780621 has 16 divisors (see below), whose sum is σ = 14684752872000. Its totient is φ = 11013291619200.

The previous prime is 12787813780597. The next prime is 12787813780669. The reversal of 12787813780621 is 12608731878721.

It is a cyclic number.

It is not a de Polignac number, because 12787813780621 - 2¹¹ = 12787813778573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12787813780621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12787813780681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18848905 + ... + 19515553.

It is an arithmetic number, because the mean of its divisors is an integer number (917797054500).

Almost surely, 2^{12787813780621} is an apocalyptic number.

12787813780621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12787813780621 is a deficient number, since it is larger than the sum of its proper divisors (1896939091379).

12787813780621 is a wasteful number, since it uses less digits than its factorization.

12787813780621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758460.

The product of its (nonzero) digits is 12644352, while the sum is 61.

The spelling of 12787813780621 in words is "twelve trillion, seven hundred eighty-seven billion, eight hundred thirteen million, seven hundred eighty thousand, six hundred twenty-one".