11011100221021 has 4 divisors (see below), whose sum is σ = 11011181287132. Its totient is φ = 11011019154912.

The previous prime is 11011100220997. The next prime is 11011100221049. The reversal of 11011100221021 is 12012200111011.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1580335608996 + 9430764612025 = 1257114^2 + 3070955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011100221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011100220992 and 11011100221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011100221081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40328970 + ... + 40601083.

It is an arithmetic number, because the mean of its divisors is an integer number (2752795321783).

Almost surely, 2^{11011100221021} is an apocalyptic number.

It is an amenable number.

11011100221021 is a deficient number, since it is larger than the sum of its proper divisors (81066111).

11011100221021 is an equidigital number, since it uses as much as digits as its factorization.

11011100221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81066110.

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

Adding to 11011100221021 its reverse (12012200111011), we get a palindrome (23023300332032).

The spelling of 11011100221021 in words is "eleven trillion, eleven billion, one hundred million, two hundred twenty-one thousand, twenty-one".