21208606984 has 32 divisors (see below), whose sum is σ = 40148222400. Its totient is φ = 10502498880.

The previous prime is 21208606973. The next prime is 21208607009. The reversal of 21208606984 is 48960680212.

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, 3040669 + ... + 3047635.

It is an arithmetic number, because the mean of its divisors is an integer number (1254631950).

Almost surely, 2^21208606984 is an apocalyptic number.

It is an amenable number.

21208606984 is a deficient number, since it is larger than the sum of its proper divisors (18939615416).

21208606984 is a wasteful number, since it uses less digits than its factorization.

21208606984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10573 (or 10569 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 21208606984 in words is "twenty-one billion, two hundred eight million, six hundred six thousand, nine hundred eighty-four".