20311233100397 has 2 divisors, whose sum is σ = 20311233100398. Its totient is φ = 20311233100396.

The previous prime is 20311233100331. The next prime is 20311233100453. The reversal of 20311233100397 is 79300133211302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19484932102276 + 826300998121 = 4414174^2 + 909011^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311233100397 - 2¹⁴ = 20311233084013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311233100097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155616550198 + 10155616550199.

It is an arithmetic number, because the mean of its divisors is an integer number (10155616550199).

Almost surely, 2^{20311233100397} is an apocalyptic number.

It is an amenable number.

20311233100397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311233100397 is an equidigital number, since it uses as much as digits as its factorization.

20311233100397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 35.

Adding to 20311233100397 its reverse (79300133211302), we get a palindrome (99611366311699).

The spelling of 20311233100397 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-three million, one hundred thousand, three hundred ninety-seven".