21089996 has 24 divisors (see below), whose sum is σ = 39238416. Its totient is φ = 9884160.

The previous prime is 21089993. The next prime is 21090007. The reversal of 21089996 is 69998012.

It is not an unprimeable number, because it can be changed into a prime (21089993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22040 + ... + 22976.

It is an arithmetic number, because the mean of its divisors is an integer number (1634934).

Almost surely, 2^21089996 is an apocalyptic number.

It is an amenable number.

21089996 is a deficient number, since it is larger than the sum of its proper divisors (18148420).

21089996 is a wasteful number, since it uses less digits than its factorization.

21089996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 21089996 is about 4592.3845657784. The cubic root of 21089996 is about 276.2859704872.

The spelling of 21089996 in words is "twenty-one million, eighty-nine thousand, nine hundred ninety-six".