21071033 has 2 divisors, whose sum is σ = 21071034. Its totient is φ = 21071032.

The previous prime is 21071021. The next prime is 21071053. The reversal of 21071033 is 33017012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 1605289 = 4412^2 + 1267^2 .

It is a cyclic number.

It is not a de Polignac number, because 21071033 - 2⁶ = 21070969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21071003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10535516 + 10535517.

It is an arithmetic number, because the mean of its divisors is an integer number (10535517).

Almost surely, 2^21071033 is an apocalyptic number.

It is an amenable number.

21071033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071033 is an equidigital number, since it uses as much as digits as its factorization.

21071033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 21071033 is about 4590.3194877917. The cubic root of 21071033 is about 276.2031384513.

Adding to 21071033 its reverse (33017012), we get a palindrome (54088045).

The spelling of 21071033 in words is "twenty-one million, seventy-one thousand, thirty-three".