21001000011 has 16 divisors (see below), whose sum is σ = 29223714816. Its totient is φ = 13389681536.

The previous prime is 21001000001. The next prime is 21001000019. The reversal of 21001000011 is 11000010012.

It is a cyclic number.

It is not a de Polignac number, because 21001000011 - 2⁵ = 21000999979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001000019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449206 + ... + 493748.

It is an arithmetic number, because the mean of its divisors is an integer number (1826482176).

Almost surely, 2^21001000011 is an apocalyptic number.

21001000011 is a deficient number, since it is larger than the sum of its proper divisors (8222714805).

21001000011 is a wasteful number, since it uses less digits than its factorization.

21001000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51402.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21001000011 its reverse (11000010012), we get a palindrome (32001010023).

The spelling of 21001000011 in words is "twenty-one billion, one million, eleven", and thus it is an aban number and an uban number.