21140033 has 2 divisors, whose sum is σ = 21140034. Its totient is φ = 21140032.

The previous prime is 21140011. The next prime is 21140069. The reversal of 21140033 is 33004112.

21140033 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 1364224 = 4447^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140033 - 2⁸ = 21139777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21140003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570016 + 10570017.

It is an arithmetic number, because the mean of its divisors is an integer number (10570017).

Almost surely, 2^21140033 is an apocalyptic number.

It is an amenable number.

21140033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140033 is an equidigital number, since it uses as much as digits as its factorization.

21140033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21140033 is about 4597.8291616805. The cubic root of 21140033 is about 276.5042983678.

Adding to 21140033 its reverse (33004112), we get a palindrome (54144145).

The spelling of 21140033 in words is "twenty-one million, one hundred forty thousand, thirty-three".