21845033 has 12 divisors (see below), whose sum is σ = 26289540. Its totient is φ = 18077472.

The previous prime is 21845029. The next prime is 21845069. The reversal of 21845033 is 33054812.

It can be written as a sum of positive squares in 2 ways, for example, as 4439449 + 17405584 = 2107^2 + 4172^2 .

It is not a de Polignac number, because 21845033 - 2² = 21845029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21844993 and 21845011.

It is not an unprimeable number, because it can be changed into a prime (21845233) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 6266 + ... + 9107.

It is an arithmetic number, because the mean of its divisors is an integer number (2190795).

Almost surely, 2^21845033 is an apocalyptic number.

It is an amenable number.

21845033 is a deficient number, since it is larger than the sum of its proper divisors (4444507).

21845033 is a wasteful number, since it uses less digits than its factorization.

21845033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15416 (or 15409 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21845033 is about 4673.8670284894. The cubic root of 21845033 is about 279.5444676290.

Adding to 21845033 its reverse (33054812), we get a palindrome (54899845).

The spelling of 21845033 in words is "twenty-one million, eight hundred forty-five thousand, thirty-three".