21022112111 has 32 divisors (see below), whose sum is σ = 28240697856. Its totient is φ = 15112656000.

The previous prime is 21022112101. The next prime is 21022112117. The reversal of 21022112111 is 11121122012.

It is not a de Polignac number, because 21022112111 - 2¹⁸ = 21021849967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022112117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2338856 + ... + 2347826.

It is an arithmetic number, because the mean of its divisors is an integer number (882521808).

Almost surely, 2^21022112111 is an apocalyptic number.

21022112111 is a deficient number, since it is larger than the sum of its proper divisors (7218585745).

21022112111 is a wasteful number, since it uses less digits than its factorization.

21022112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11343.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21022112111 its reverse (11121122012), we get a palindrome (32143234123).

Subtracting from 21022112111 its reverse (11121122012), we obtain a palindrome (9900990099).

The spelling of 21022112111 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred eleven".