20133212009 has 2 divisors, whose sum is σ = 20133212010. Its totient is φ = 20133212008.

The previous prime is 20133211999. The next prime is 20133212023. The reversal of 20133212009 is 90021233102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15937800025 + 4195411984 = 126245^2 + 64772^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133212009 - 2²⁰ = 20132163433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20133272009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066606004 + 10066606005.

It is an arithmetic number, because the mean of its divisors is an integer number (10066606005).

Almost surely, 2^20133212009 is an apocalyptic number.

It is an amenable number.

20133212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133212009 is an equidigital number, since it uses as much as digits as its factorization.

20133212009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 20133212009 in words is "twenty billion, one hundred thirty-three million, two hundred twelve thousand, nine".