20311232213101 has 2 divisors, whose sum is σ = 20311232213102. Its totient is φ = 20311232213100.

The previous prime is 20311232213099. The next prime is 20311232213171. The reversal of 20311232213101 is 10131223211302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14743987244100 + 5567244969001 = 3839790^2 + 2359501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311232213101 - 2¹ = 20311232213099 is a prime.

Together with 20311232213099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311232213171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155616106550 + 10155616106551.

It is an arithmetic number, because the mean of its divisors is an integer number (10155616106551).

Almost surely, 2^{20311232213101} is an apocalyptic number.

It is an amenable number.

20311232213101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311232213101 is an equidigital number, since it uses as much as digits as its factorization.

20311232213101 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.

Adding to 20311232213101 its reverse (10131223211302), we get a palindrome (30442455424403).

The spelling of 20311232213101 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-two million, two hundred thirteen thousand, one hundred one".