21124231441 has 4 divisors (see below), whose sum is σ = 21240940084. Its totient is φ = 21007522800.

The previous prime is 21124231423. The next prime is 21124231459. The reversal of 21124231441 is 14413242112.

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

It is an interprime number because it is at equal distance from previous prime (21124231423) and next prime (21124231459).

It can be written as a sum of positive squares in 2 ways, for example, as 10802484225 + 10321747216 = 103935^2 + 101596^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124231441 - 2¹⁵ = 21124198673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124231411) 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, 58354050 + ... + 58354411.

It is an arithmetic number, because the mean of its divisors is an integer number (5310235021).

Almost surely, 2^21124231441 is an apocalyptic number.

It is an amenable number.

21124231441 is a deficient number, since it is larger than the sum of its proper divisors (116708643).

21124231441 is a wasteful number, since it uses less digits than its factorization.

21124231441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116708642.

The product of its digits is 1536, while the sum is 25.

Adding to 21124231441 its reverse (14413242112), we get a palindrome (35537473553).

The spelling of 21124231441 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-one thousand, four hundred forty-one".