21089076 has 24 divisors (see below), whose sum is σ = 49348320. Its totient is φ = 7009632.

The previous prime is 21089051. The next prime is 21089087. The reversal of 21089076 is 67098012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2230 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (2056180).

Almost surely, 2^21089076 is an apocalyptic number.

It is an amenable number.

21089076 is an abundant number, since it is smaller than the sum of its proper divisors (28259244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21089076 is a wasteful number, since it uses less digits than its factorization.

21089076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5021 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21089076 is about 4592.2843988586. The cubic root of 21089076 is about 276.2819529933.

The spelling of 21089076 in words is "twenty-one million, eighty-nine thousand, seventy-six".