12587226821 has 16 divisors (see below), whose sum is σ = 13605864048. Its totient is φ = 11575872000.

The previous prime is 12587226811. The next prime is 12587226829. The reversal of 12587226821 is 12862278521.

It can be written as a sum of positive squares in 8 ways, for example, as 5002732900 + 7584493921 = 70730^2 + 87089^2 .

It is a cyclic number.

It is not a de Polignac number, because 12587226821 - 2¹⁰ = 12587225797 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 (12587226829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6988121 + ... + 6989921.

It is an arithmetic number, because the mean of its divisors is an integer number (850366503).

Almost surely, 2^12587226821 is an apocalyptic number.

It is an amenable number.

12587226821 is a deficient number, since it is larger than the sum of its proper divisors (1018637227).

12587226821 is a wasteful number, since it uses less digits than its factorization.

12587226821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512.

The product of its digits is 215040, while the sum is 44.

The spelling of 12587226821 in words is "twelve billion, five hundred eighty-seven million, two hundred twenty-six thousand, eight hundred twenty-one".