21120216986 has 16 divisors (see below), whose sum is σ = 34682486688. Its totient is φ = 9566173200.

The previous prime is 21120216937. The next prime is 21120217007. The reversal of 21120216986 is 68961202112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1689905 + ... + 1702356.

It is an arithmetic number, because the mean of its divisors is an integer number (2167655418).

Almost surely, 2^21120216986 is an apocalyptic number.

21120216986 is a deficient number, since it is larger than the sum of its proper divisors (13562269702).

21120216986 is a wasteful number, since it uses less digits than its factorization.

21120216986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392557.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 21120216986 in words is "twenty-one billion, one hundred twenty million, two hundred sixteen thousand, nine hundred eighty-six".