21111000211 has 12 divisors (see below), whose sum is σ = 24637704168. Its totient is φ = 18036188352.

The previous prime is 21111000203. The next prime is 21111000223. The reversal of 21111000211 is 11200011112.

It is not a de Polignac number, because 21111000211 - 2³ = 21111000203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111000511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686646 + ... + 716731.

It is an arithmetic number, because the mean of its divisors is an integer number (2053142014).

Almost surely, 2^21111000211 is an apocalyptic number.

21111000211 is a deficient number, since it is larger than the sum of its proper divisors (3526703957).

21111000211 is a wasteful number, since it uses less digits than its factorization.

21111000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403698 (or 1403691 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111000211 its reverse (11200011112), we get a palindrome (32311011323).

The spelling of 21111000211 in words is "twenty-one billion, one hundred eleven million, two hundred eleven", and thus it is an aban number.