21124233111 has 16 divisors (see below), whose sum is σ = 28211462528. Its totient is φ = 14059936800.

The previous prime is 21124233059. The next prime is 21124233211. The reversal of 21124233111 is 11133242112.

It is not a de Polignac number, because 21124233111 - 2⁶ = 21124233047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124233211) 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, 7733616 + ... + 7736346.

It is an arithmetic number, because the mean of its divisors is an integer number (1763216408).

Almost surely, 2^21124233111 is an apocalyptic number.

21124233111 is a deficient number, since it is larger than the sum of its proper divisors (7087229417).

21124233111 is a wasteful number, since it uses less digits than its factorization.

21124233111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982.

The product of its digits is 288, while the sum is 21.

Adding to 21124233111 its reverse (11133242112), we get a palindrome (32257475223).

Subtracting from 21124233111 its reverse (11133242112), we obtain a palindrome (9990990999).

The spelling of 21124233111 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-three thousand, one hundred eleven".