11101010111021 has 2 divisors, whose sum is σ = 11101010111022. Its totient is φ = 11101010111020.

The previous prime is 11101010111017. The next prime is 11101010111041. The reversal of 11101010111021 is 12011101010111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5842638294025 + 5258371816996 = 2417155^2 + 2293114^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101010111021 - 2² = 11101010111017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11101010110993 and 11101010111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101010111041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550505055510 + 5550505055511.

It is an arithmetic number, because the mean of its divisors is an integer number (5550505055511).

Almost surely, 2^{11101010111021} is an apocalyptic number.

It is an amenable number.

11101010111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101010111021 is an equidigital number, since it uses as much as digits as its factorization.

11101010111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11101010111021 its reverse (12011101010111), we get a palindrome (23112111121132).

The spelling of 11101010111021 in words is "eleven trillion, one hundred one billion, ten million, one hundred eleven thousand, twenty-one".