21348867987 has 12 divisors (see below), whose sum is σ = 30851434120. Its totient is φ = 14226033888.

The previous prime is 21348867979. The next prime is 21348868003. The reversal of 21348867987 is 78976884312.

21348867987 is a `hidden beast` number, since 2 + 1 + 3 + 488 + 6 + 79 + 87 = 666.

It is not a de Polignac number, because 21348867987 - 2³ = 21348867979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21348847987) 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 11 ways as a sum of consecutive naturals, for example, 524698 + ... + 563919.

Almost surely, 2^21348867987 is an apocalyptic number.

21348867987 is a deficient number, since it is larger than the sum of its proper divisors (9502566133).

21348867987 is a wasteful number, since it uses less digits than its factorization.

21348867987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090802 (or 1090799 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 21348867987 in words is "twenty-one billion, three hundred forty-eight million, eight hundred sixty-seven thousand, nine hundred eighty-seven".