12887478821 has 8 divisors (see below), whose sum is σ = 15503734080. Its totient is φ = 10465020288.

The previous prime is 12887478811. The next prime is 12887478823.

12887478821 is nontrivially palindromic in base 10.

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 12887478821 - 2¹⁴ = 12887462437 is a prime.

It is a super-2 number, since 2×12887478821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12887478823) 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, 48449036 + ... + 48449301.

It is an arithmetic number, because the mean of its divisors is an integer number (1937966760).

Almost surely, 2^12887478821 is an apocalyptic number.

It is an amenable number.

12887478821 is a deficient number, since it is larger than the sum of its proper divisors (2616255259).

12887478821 is an equidigital number, since it uses as much as digits as its factorization.

12887478821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96898363.

The product of its digits is 3211264, while the sum is 56.

The spelling of 12887478821 in words is "twelve billion, eight hundred eighty-seven million, four hundred seventy-eight thousand, eight hundred twenty-one".