111131021021 has 2 divisors, whose sum is σ = 111131021022. Its totient is φ = 111131021020.

The previous prime is 111131021003. The next prime is 111131021059. The reversal of 111131021021 is 120120131111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84468703225 + 26662317796 = 290635^2 + 163286^2 .

It is an emirp because it is prime and its reverse (120120131111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111131021021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111131020987 and 111131021005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111131021321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55565510510 + 55565510511.

It is an arithmetic number, because the mean of its divisors is an integer number (55565510511).

Almost surely, 2^111131021021 is an apocalyptic number.

It is an amenable number.

111131021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111131021021 is an equidigital number, since it uses as much as digits as its factorization.

111131021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 111131021021 its reverse (120120131111), we get a palindrome (231251152132).

The spelling of 111131021021 in words is "one hundred eleven billion, one hundred thirty-one million, twenty-one thousand, twenty-one".