21465836 has 12 divisors (see below), whose sum is σ = 42931728. Its totient is φ = 9199632.

The previous prime is 21465827. The next prime is 21465841. The reversal of 21465836 is 63856412.

21465836 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21465796 and 21465805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383291 + ... + 383346.

It is an arithmetic number, because the mean of its divisors is an integer number (3577644).

Almost surely, 2^21465836 is an apocalyptic number.

It is an amenable number.

21465836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21465836 is a wasteful number, since it uses less digits than its factorization.

21465836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766648 (or 766646 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21465836 is about 4633.1237842302. The cubic root of 21465836 is about 277.9175263866.

The spelling of 21465836 in words is "twenty-one million, four hundred sixty-five thousand, eight hundred thirty-six".