11331131111021 has 2 divisors, whose sum is σ = 11331131111022. Its totient is φ = 11331131111020.

The previous prime is 11331131110933. The next prime is 11331131111023. The reversal of 11331131111021 is 12011113113311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5671728008521 + 5659403102500 = 2381539^2 + 2378950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11331131111021 is a prime.

Together with 11331131111023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11331131110984 and 11331131111002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11331131111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5665565555510 + 5665565555511.

It is an arithmetic number, because the mean of its divisors is an integer number (5665565555511).

Almost surely, 2^{11331131111021} is an apocalyptic number.

It is an amenable number.

11331131111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11331131111021 is an equidigital number, since it uses as much as digits as its factorization.

11331131111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 20.

Adding to 11331131111021 its reverse (12011113113311), we get a palindrome (23342244224332).

The spelling of 11331131111021 in words is "eleven trillion, three hundred thirty-one billion, one hundred thirty-one million, one hundred eleven thousand, twenty-one".