21364833 has 24 divisors (see below), whose sum is σ = 33488640. Its totient is φ = 12079200.

The previous prime is 21364817. The next prime is 21364841. The reversal of 21364833 is 33846312.

It is not a de Polignac number, because 21364833 - 2⁴ = 21364817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21364833.

It is not an unprimeable number, because it can be changed into a prime (21364853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14128 + ... + 15566.

It is an arithmetic number, because the mean of its divisors is an integer number (1395360).

Almost surely, 2^21364833 is an apocalyptic number.

It is an amenable number.

21364833 is a deficient number, since it is larger than the sum of its proper divisors (12123807).

21364833 is a wasteful number, since it uses less digits than its factorization.

21364833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1550 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 21364833 is about 4622.2108346548. The cubic root of 21364833 is about 277.4809466668.

The spelling of 21364833 in words is "twenty-one million, three hundred sixty-four thousand, eight hundred thirty-three".