21365336 has 8 divisors (see below), whose sum is σ = 40060020. Its totient is φ = 10682664.

The previous prime is 21365303. The next prime is 21365347. The reversal of 21365336 is 63356312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21365299 and 21365308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335326 + ... + 1335341.

Almost surely, 2^21365336 is an apocalyptic number.

It is an amenable number.

21365336 is a deficient number, since it is larger than the sum of its proper divisors (18694684).

21365336 is a wasteful number, since it uses less digits than its factorization.

21365336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670673 (or 2670669 counting only the distinct ones).

The product of its digits is 9720, while the sum is 29.

The square root of 21365336 is about 4622.2652455263. The cubic root of 21365336 is about 277.4831242612.

The spelling of 21365336 in words is "twenty-one million, three hundred sixty-five thousand, three hundred thirty-six".