21103032111 has 16 divisors (see below), whose sum is σ = 32172006144. Its totient is φ = 12053248704.

The previous prime is 21103032053. The next prime is 21103032133. The reversal of 21103032111 is 11123030112.

It is a happy number.

It is not a de Polignac number, because 21103032111 - 2¹⁴ = 21103015727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103032311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188161 + ... + 278586.

It is an arithmetic number, because the mean of its divisors is an integer number (2010750384).

Almost surely, 2^21103032111 is an apocalyptic number.

21103032111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21103032111 is a deficient number, since it is larger than the sum of its proper divisors (11068974033).

21103032111 is a wasteful number, since it uses less digits than its factorization.

21103032111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468910.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21103032111 its reverse (11123030112), we get a palindrome (32226062223).

The spelling of 21103032111 in words is "twenty-one billion, one hundred three million, thirty-two thousand, one hundred eleven".