21116514988 has 6 divisors (see below), whose sum is σ = 36953901236. Its totient is φ = 10558257492.

The previous prime is 21116514967. The next prime is 21116515009. The reversal of 21116514988 is 88941561112.

It is an interprime number because it is at equal distance from previous prime (21116514967) and next prime (21116515009).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639564370 + ... + 2639564377.

Almost surely, 2^21116514988 is an apocalyptic number.

It is an amenable number.

21116514988 is a deficient number, since it is larger than the sum of its proper divisors (15837386248).

21116514988 is a wasteful number, since it uses less digits than its factorization.

21116514988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279128751 (or 5279128749 counting only the distinct ones).

The product of its digits is 138240, while the sum is 46.

The spelling of 21116514988 in words is "twenty-one billion, one hundred sixteen million, five hundred fourteen thousand, nine hundred eighty-eight".