21244124113 has 4 divisors (see below), whose sum is σ = 21311997028. Its totient is φ = 21176251200.

The previous prime is 21244124101. The next prime is 21244124117. The reversal of 21244124113 is 31142144212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3269895489 + 17974228624 = 57183^2 + 134068^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244124113 - 2⁹ = 21244123601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244124117) 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, 33935988 + ... + 33936613.

It is an arithmetic number, because the mean of its divisors is an integer number (5327999257).

Almost surely, 2^21244124113 is an apocalyptic number.

It is an amenable number.

21244124113 is a deficient number, since it is larger than the sum of its proper divisors (67872915).

21244124113 is an equidigital number, since it uses as much as digits as its factorization.

21244124113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67872914.

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

Adding to 21244124113 its reverse (31142144212), we get a palindrome (52386268325).

The spelling of 21244124113 in words is "twenty-one billion, two hundred forty-four million, one hundred twenty-four thousand, one hundred thirteen".