21113324413 has 4 divisors (see below), whose sum is σ = 21113688960. Its totient is φ = 21112959868.

The previous prime is 21113324389. The next prime is 21113324417. The reversal of 21113324413 is 31442331112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21113324413 - 2¹⁷ = 21113193341 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 (21113324417) 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, 73933 + ... + 218386.

It is an arithmetic number, because the mean of its divisors is an integer number (5278422240).

Almost surely, 2^21113324413 is an apocalyptic number.

It is an amenable number.

21113324413 is a deficient number, since it is larger than the sum of its proper divisors (364547).

21113324413 is an equidigital number, since it uses as much as digits as its factorization.

21113324413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364546.

The product of its digits is 1728, while the sum is 25.

Adding to 21113324413 its reverse (31442331112), we get a palindrome (52555655525).

The spelling of 21113324413 in words is "twenty-one billion, one hundred thirteen million, three hundred twenty-four thousand, four hundred thirteen".