21002002011 has 12 divisors (see below), whose sum is σ = 32120709192. Its totient is φ = 13177726656.

The previous prime is 21002002001. The next prime is 21002002037. The reversal of 21002002011 is 11020020012.

It is not a de Polignac number, because 21002002011 - 2⁷ = 21002001883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21002001984 and 21002002002.

It is not an unprimeable number, because it can be changed into a prime (21002002001) 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 11 ways as a sum of consecutive naturals, for example, 68633841 + ... + 68634146.

It is an arithmetic number, because the mean of its divisors is an integer number (2676725766).

Almost surely, 2^21002002011 is an apocalyptic number.

21002002011 is a deficient number, since it is larger than the sum of its proper divisors (11118707181).

21002002011 is a wasteful number, since it uses less digits than its factorization.

21002002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137268010 (or 137268007 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21002002011 its reverse (11020020012), we get a palindrome (32022022023).

The spelling of 21002002011 in words is "twenty-one billion, two million, two thousand, eleven".