20211112309 has 2 divisors, whose sum is σ = 20211112310. Its totient is φ = 20211112308.

The previous prime is 20211112297. The next prime is 20211112321. The reversal of 20211112309 is 90321111202.

It is a balanced prime because it is at equal distance from previous prime (20211112297) and next prime (20211112321).

It can be written as a sum of positive squares in only one way, i.e., 10622394225 + 9588718084 = 103065^2 + 97922^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211112309 - 2⁹ = 20211111797 is a prime.

It is a super-2 number, since 2×20211112309² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20211112309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211112409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105556154 + 10105556155.

It is an arithmetic number, because the mean of its divisors is an integer number (10105556155).

Almost surely, 2^20211112309 is an apocalyptic number.

It is an amenable number.

20211112309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211112309 is an equidigital number, since it uses as much as digits as its factorization.

20211112309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20211112309 in words is "twenty billion, two hundred eleven million, one hundred twelve thousand, three hundred nine".