21112012011 has 8 divisors (see below), whose sum is σ = 28151323200. Its totient is φ = 14073687752.

The previous prime is 21112011917. The next prime is 21112012049. The reversal of 21112012011 is 11021021112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112012011 - 2⁷ = 21112011883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112012211) 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 7 ways as a sum of consecutive naturals, for example, 195285 + ... + 283478.

It is an arithmetic number, because the mean of its divisors is an integer number (3518915400).

Almost surely, 2^21112012011 is an apocalyptic number.

21112012011 is a deficient number, since it is larger than the sum of its proper divisors (7039311189).

21112012011 is a wasteful number, since it uses less digits than its factorization.

21112012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493465.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21112012011 its reverse (11021021112), we get a palindrome (32133033123).

The spelling of 21112012011 in words is "twenty-one billion, one hundred twelve million, twelve thousand, eleven".