21054615986 has 8 divisors (see below), whose sum is σ = 31603574640. Its totient is φ = 10520091108.

The previous prime is 21054615971. The next prime is 21054616007. The reversal of 21054615986 is 68951645012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21054615986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3604796 + ... + 3610631.

It is an arithmetic number, because the mean of its divisors is an integer number (3950446830).

Almost surely, 2^21054615986 is an apocalyptic number.

21054615986 is a deficient number, since it is larger than the sum of its proper divisors (10548958654).

21054615986 is a wasteful number, since it uses less digits than its factorization.

21054615986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216888.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 21054615986 in words is "twenty-one billion, fifty-four million, six hundred fifteen thousand, nine hundred eighty-six".