20311210219309 has 2 divisors, whose sum is σ = 20311210219310. Its totient is φ = 20311210219308.

The previous prime is 20311210219231. The next prime is 20311210219327. The reversal of 20311210219309 is 90391201211302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19459655916100 + 851554303209 = 4411310^2 + 922797^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311210219309 - 2¹¹ = 20311210217261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311210219009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155605109654 + 10155605109655.

It is an arithmetic number, because the mean of its divisors is an integer number (10155605109655).

Almost surely, 2^{20311210219309} is an apocalyptic number.

It is an amenable number.

20311210219309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311210219309 is an equidigital number, since it uses as much as digits as its factorization.

20311210219309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 20311210219309 in words is "twenty trillion, three hundred eleven billion, two hundred ten million, two hundred nineteen thousand, three hundred nine".