11002011021 has 6 divisors (see below), whose sum is σ = 15891793710. Its totient is φ = 7334674008.

The previous prime is 11002011001. The next prime is 11002011037. The reversal of 11002011021 is 12011020011.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7131802500 + 3870208521 = 84450^2 + 62211^2 .

It is not a de Polignac number, because 11002011021 - 2⁷ = 11002010893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1222445669 = 11002011021 / (1 + 1 + 0 + 0 + 2 + 0 + 1 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 11002010994 and 11002011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11002011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611222826 + ... + 611222843.

It is an arithmetic number, because the mean of its divisors is an integer number (2648632285).

Almost surely, 2^11002011021 is an apocalyptic number.

It is an amenable number.

11002011021 is a deficient number, since it is larger than the sum of its proper divisors (4889782689).

11002011021 is a wasteful number, since it uses less digits than its factorization.

11002011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222445675 (or 1222445672 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11002011021 its reverse (12011020011), we get a palindrome (23013031032).

The spelling of 11002011021 in words is "eleven billion, two million, eleven thousand, twenty-one".