21233134009 has 2 divisors, whose sum is σ = 21233134010. Its totient is φ = 21233134008.

The previous prime is 21233134007. The next prime is 21233134061. The reversal of 21233134009 is 90043133212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18570057984 + 2663076025 = 136272^2 + 51605^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233134009 - 2¹ = 21233134007 is a prime.

Together with 21233134007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21233134003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616567004 + 10616567005.

It is an arithmetic number, because the mean of its divisors is an integer number (10616567005).

Almost surely, 2^21233134009 is an apocalyptic number.

It is an amenable number.

21233134009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233134009 is an equidigital number, since it uses as much as digits as its factorization.

21233134009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21233134009 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-four thousand, nine".