21225033 has 12 divisors (see below), whose sum is σ = 32272240. Its totient is φ = 13405176.

The previous prime is 21224989. The next prime is 21225037. The reversal of 21225033 is 33052212.

It is not a de Polignac number, because 21225033 - 2⁹ = 21224521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21224997 and 21225015.

It is not an unprimeable number, because it can be changed into a prime (21225037) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61891 + ... + 62232.

Almost surely, 2^21225033 is an apocalyptic number.

It is an amenable number.

21225033 is a deficient number, since it is larger than the sum of its proper divisors (11047207).

21225033 is a wasteful number, since it uses less digits than its factorization.

21225033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124148 (or 124145 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21225033 is about 4607.0633813743. The cubic root of 21225033 is about 276.8743929552.

Adding to 21225033 its reverse (33052212), we get a palindrome (54277245).

The spelling of 21225033 in words is "twenty-one million, two hundred twenty-five thousand, thirty-three".