21123111441 has 32 divisors (see below), whose sum is σ = 28930867200. Its totient is φ = 13702505024.

The previous prime is 21123111391. The next prime is 21123111467. The reversal of 21123111441 is 14411132112.

It is a cyclic number.

It is not a de Polignac number, because 21123111441 - 2⁶ = 21123111377 is a prime.

It is a super-3 number, since 3×21123111441³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21123111491) 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, 32347471 + ... + 32348123.

It is an arithmetic number, because the mean of its divisors is an integer number (904089600).

Almost surely, 2^21123111441 is an apocalyptic number.

It is an amenable number.

21123111441 is a deficient number, since it is larger than the sum of its proper divisors (7807755759).

21123111441 is a wasteful number, since it uses less digits than its factorization.

21123111441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685.

The product of its digits is 192, while the sum is 21.

Adding to 21123111441 its reverse (14411132112), we get a palindrome (35534243553).

The spelling of 21123111441 in words is "twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, four hundred forty-one".