21245033 has 2 divisors, whose sum is σ = 21245034. Its totient is φ = 21245032.

The previous prime is 21245027. The next prime is 21245051. The reversal of 21245033 is 33054212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 8082649 = 3628^2 + 2843^2 .

It is a cyclic number.

It is not a de Polignac number, because 21245033 - 2⁶ = 21244969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21244996 and 21245014.

It is not a weakly prime, because it can be changed into another prime (21245533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622516 + 10622517.

It is an arithmetic number, because the mean of its divisors is an integer number (10622517).

Almost surely, 2^21245033 is an apocalyptic number.

It is an amenable number.

21245033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245033 is an equidigital number, since it uses as much as digits as its factorization.

21245033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21245033 is about 4609.2334503689. The cubic root of 21245033 is about 276.9613303854.

Adding to 21245033 its reverse (33054212), we get a palindrome (54299245).

The spelling of 21245033 in words is "twenty-one million, two hundred forty-five thousand, thirty-three".