21033007 has 2 divisors, whose sum is σ = 21033008. Its totient is φ = 21033006.

The previous prime is 21032993. The next prime is 21033011. The reversal of 21033007 is 70033012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033907) 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 as a sum of consecutive naturals, namely, 10516503 + 10516504.

It is an arithmetic number, because the mean of its divisors is an integer number (10516504).

Almost surely, 2^21033007 is an apocalyptic number.

21033007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033007 is an equidigital number, since it uses as much as digits as its factorization.

21033007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 21033007 is about 4586.1756398987. The cubic root of 21033007 is about 276.0368877043.

Adding to 21033007 its reverse (70033012), we get a palindrome (91066019).

The spelling of 21033007 in words is "twenty-one million, thirty-three thousand, seven".