20111112121381 has 2 divisors, whose sum is σ = 20111112121382. Its totient is φ = 20111112121380.

The previous prime is 20111112121297. The next prime is 20111112121417. The reversal of 20111112121381 is 18312121111102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18799239684481 + 1311872436900 = 4335809^2 + 1145370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111112121381 - 2³⁵ = 20076752383013 is a prime.

It is a super-2 number, since 2×20111112121381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111112121181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055556060690 + 10055556060691.

It is an arithmetic number, because the mean of its divisors is an integer number (10055556060691).

Almost surely, 2^{20111112121381} is an apocalyptic number.

It is an amenable number.

20111112121381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111112121381 is an equidigital number, since it uses as much as digits as its factorization.

20111112121381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 25.

Adding to 20111112121381 its reverse (18312121111102), we get a palindrome (38423233232483).

The spelling of 20111112121381 in words is "twenty trillion, one hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, three hundred eighty-one".