21230033009 has 2 divisors, whose sum is σ = 21230033010. Its totient is φ = 21230033008.

The previous prime is 21230032997. The next prime is 21230033023. The reversal of 21230033009 is 90033003212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15135888784 + 6094144225 = 123028^2 + 78065^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230033009 - 2²⁰ = 21228984433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230033029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615016504 + 10615016505.

It is an arithmetic number, because the mean of its divisors is an integer number (10615016505).

Almost surely, 2^21230033009 is an apocalyptic number.

It is an amenable number.

21230033009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230033009 is an equidigital number, since it uses as much as digits as its factorization.

21230033009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 23.

The spelling of 21230033009 in words is "twenty-one billion, two hundred thirty million, thirty-three thousand, nine".