11110001221021 has 2 divisors, whose sum is σ = 11110001221022. Its totient is φ = 11110001221020.

The previous prime is 11110001221003. The next prime is 11110001221043. The reversal of 11110001221021 is 12012210001111.

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., 5816711709796 + 5293289511225 = 2411786^2 + 2300715^2 .

It is an emirp because it is prime and its reverse (12012210001111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11110001221021 - 2³³ = 11101411286429 is a prime.

It is a super-2 number, since 2×11110001221021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11110001220992 and 11110001221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11110001221051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555000610510 + 5555000610511.

It is an arithmetic number, because the mean of its divisors is an integer number (5555000610511).

Almost surely, 2^{11110001221021} is an apocalyptic number.

It is an amenable number.

11110001221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11110001221021 is an equidigital number, since it uses as much as digits as its factorization.

11110001221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11110001221021 its reverse (12012210001111), we get a palindrome (23122211222132).

The spelling of 11110001221021 in words is "eleven trillion, one hundred ten billion, one million, two hundred twenty-one thousand, twenty-one".