20330021311309 has 2 divisors, whose sum is σ = 20330021311310. Its totient is φ = 20330021311308.

The previous prime is 20330021311283. The next prime is 20330021311321. The reversal of 20330021311309 is 90311312003302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18316020397284 + 2014000914025 = 4279722^2 + 1419155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330021311309 is a prime.

It is a super-2 number, since 2×20330021311309² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20330021311399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165010655654 + 10165010655655.

It is an arithmetic number, because the mean of its divisors is an integer number (10165010655655).

Almost surely, 2^{20330021311309} is an apocalyptic number.

It is an amenable number.

20330021311309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330021311309 is an equidigital number, since it uses as much as digits as its factorization.

20330021311309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 20330021311309 in words is "twenty trillion, three hundred thirty billion, twenty-one million, three hundred eleven thousand, three hundred nine".