21033242089 has 2 divisors, whose sum is σ = 21033242090. Its totient is φ = 21033242088.

The previous prime is 21033242081. The next prime is 21033242141. The reversal of 21033242089 is 98024233012.

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., 21005574489 + 27667600 = 144933^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033242089 - 2³ = 21033242081 is a prime.

It is a super-3 number, since 3×21033242089³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21033242081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516621044 + 10516621045.

It is an arithmetic number, because the mean of its divisors is an integer number (10516621045).

Almost surely, 2^21033242089 is an apocalyptic number.

It is an amenable number.

21033242089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033242089 is an equidigital number, since it uses as much as digits as its factorization.

21033242089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21033242089 in words is "twenty-one billion, thirty-three million, two hundred forty-two thousand, eighty-nine".