21104681996 has 6 divisors (see below), whose sum is σ = 36933193500. Its totient is φ = 10552340996.

The previous prime is 21104681963. The next prime is 21104682013. The reversal of 21104681996 is 69918640112.

It is a self number, because there is not a number n which added to its sum of digits gives 21104681996.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638085246 + ... + 2638085253.

It is an arithmetic number, because the mean of its divisors is an integer number (6155532250).

Almost surely, 2^21104681996 is an apocalyptic number.

It is an amenable number.

21104681996 is a deficient number, since it is larger than the sum of its proper divisors (15828511504).

21104681996 is a wasteful number, since it uses less digits than its factorization.

21104681996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276170503 (or 5276170501 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 21104681996 in words is "twenty-one billion, one hundred four million, six hundred eighty-one thousand, nine hundred ninety-six".