20211022309 has 2 divisors, whose sum is σ = 20211022310. Its totient is φ = 20211022308.

The previous prime is 20211022289. The next prime is 20211022327. The reversal of 20211022309 is 90322011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17866332225 + 2344690084 = 133665^2 + 48422^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211022309 - 2¹⁵ = 20210989541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211022309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211022379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105511154 + 10105511155.

It is an arithmetic number, because the mean of its divisors is an integer number (10105511155).

Almost surely, 2^20211022309 is an apocalyptic number.

It is an amenable number.

20211022309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211022309 is an equidigital number, since it uses as much as digits as its factorization.

20211022309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 20211022309 in words is "twenty billion, two hundred eleven million, twenty-two thousand, three hundred nine".