20133211309 has 2 divisors, whose sum is σ = 20133211310. Its totient is φ = 20133211308.

The previous prime is 20133211261. The next prime is 20133211327. The reversal of 20133211309 is 90311233102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12690698409 + 7442512900 = 112653^2 + 86270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133211309 - 2⁷ = 20133211181 is a prime.

It is a super-2 number, since 2×20133211309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20133211369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066605654 + 10066605655.

It is an arithmetic number, because the mean of its divisors is an integer number (10066605655).

Almost surely, 2^20133211309 is an apocalyptic number.

It is an amenable number.

20133211309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133211309 is an equidigital number, since it uses as much as digits as its factorization.

20133211309 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 25.

The spelling of 20133211309 in words is "twenty billion, one hundred thirty-three million, two hundred eleven thousand, three hundred nine".