11011012021021 has 4 divisors (see below), whose sum is σ = 11011018981500. Its totient is φ = 11011005060544.

The previous prime is 11011012020977. The next prime is 11011012021033. The reversal of 11011012021021 is 12012021011011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5359271300100 + 5651740720921 = 2315010^2 + 2377339^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011012021021 - 2⁹ = 11011012020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011012020992 and 11011012021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011012081021) 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 in 3 ways as a sum of consecutive naturals, for example, 166155 + ... + 4695703.

It is an arithmetic number, because the mean of its divisors is an integer number (2752754745375).

Almost surely, 2^{11011012021021} is an apocalyptic number.

It is an amenable number.

11011012021021 is a deficient number, since it is larger than the sum of its proper divisors (6960479).

11011012021021 is an equidigital number, since it uses as much as digits as its factorization.

11011012021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6960478.

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

Adding to 11011012021021 its reverse (12012021011011), we get a palindrome (23023033032032).

The spelling of 11011012021021 in words is "eleven trillion, eleven billion, twelve million, twenty-one thousand, twenty-one".