12987478021 has 8 divisors (see below), whose sum is σ = 14884179840. Its totient is φ = 11101113168.

The previous prime is 12987478013. The next prime is 12987478027. The reversal of 12987478021 is 12087478921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12987478021 - 2³ = 12987478013 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 (12987478027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2581546 + ... + 2586571.

It is an arithmetic number, because the mean of its divisors is an integer number (1860522480).

Almost surely, 2^12987478021 is an apocalyptic number.

It is an amenable number.

12987478021 is a deficient number, since it is larger than the sum of its proper divisors (1896701819).

12987478021 is an equidigital number, since it uses as much as digits as its factorization.

12987478021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5168483.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 12987478021 in words is "twelve billion, nine hundred eighty-seven million, four hundred seventy-eight thousand, twenty-one".