21033011071 has 2 divisors, whose sum is σ = 21033011072. Its totient is φ = 21033011070.

The previous prime is 21033011017. The next prime is 21033011123. The reversal of 21033011071 is 17011033012.

Together with previous prime (21033011017) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033011071 - 2¹⁷ = 21032879999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033014071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516505535 + 10516505536.

It is an arithmetic number, because the mean of its divisors is an integer number (10516505536).

Almost surely, 2^21033011071 is an apocalyptic number.

21033011071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033011071 is an equidigital number, since it uses as much as digits as its factorization.

21033011071 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 19.

Adding to 21033011071 its reverse (17011033012), we get a palindrome (38044044083).

The spelling of 21033011071 in words is "twenty-one billion, thirty-three million, eleven thousand, seventy-one".