21044234111 has 4 divisors (see below), whose sum is σ = 22151825400. Its totient is φ = 19936642824.

The previous prime is 21044234089. The next prime is 21044234119. The reversal of 21044234111 is 11143244012.

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

It is a cyclic number.

It is not a de Polignac number, because 21044234111 - 2¹⁰ = 21044233087 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 (21044234119) 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, 553795616 + ... + 553795653.

It is an arithmetic number, because the mean of its divisors is an integer number (5537956350).

Almost surely, 2^21044234111 is an apocalyptic number.

21044234111 is a deficient number, since it is larger than the sum of its proper divisors (1107591289).

21044234111 is a wasteful number, since it uses less digits than its factorization.

21044234111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107591288.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21044234111 its reverse (11143244012), we get a palindrome (32187478123).

Subtracting from 21044234111 its reverse (11143244012), we obtain a palindrome (9900990099).

The spelling of 21044234111 in words is "twenty-one billion, forty-four million, two hundred thirty-four thousand, one hundred eleven".