21003112011 has 12 divisors (see below), whose sum is σ = 32576255592. Its totient is φ = 12001778208.

The previous prime is 21003111979. The next prime is 21003112061. The reversal of 21003112011 is 11021130012.

It is not a de Polignac number, because 21003112011 - 2⁵ = 21003111979 is a prime.

It is a super-2 number, since 2×21003112011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003112061) 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 11 ways as a sum of consecutive naturals, for example, 71439010 + ... + 71439303.

It is an arithmetic number, because the mean of its divisors is an integer number (2714687966).

Almost surely, 2^21003112011 is an apocalyptic number.

21003112011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21003112011 is a deficient number, since it is larger than the sum of its proper divisors (11573143581).

21003112011 is a wasteful number, since it uses less digits than its factorization.

21003112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142878330 (or 142878323 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21003112011 its reverse (11021130012), we get a palindrome (32024242023).

The spelling of 21003112011 in words is "twenty-one billion, three million, one hundred twelve thousand, eleven".