21112010211 has 4 divisors (see below), whose sum is σ = 28149346952. Its totient is φ = 14074673472.

The previous prime is 21112010209. The next prime is 21112010233. The reversal of 21112010211 is 11201021112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21112010211 - 2¹ = 21112010209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112010261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518668366 + ... + 3518668371.

It is an arithmetic number, because the mean of its divisors is an integer number (7037336738).

Almost surely, 2^21112010211 is an apocalyptic number.

21112010211 is a deficient number, since it is larger than the sum of its proper divisors (7037336741).

21112010211 is an equidigital number, since it uses as much as digits as its factorization.

21112010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037336740.

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

Adding to 21112010211 its reverse (11201021112), we get a palindrome (32313031323).

The spelling of 21112010211 in words is "twenty-one billion, one hundred twelve million, ten thousand, two hundred eleven".