21113324213 has 4 divisors (see below), whose sum is σ = 21113751948. Its totient is φ = 21112896480.

The previous prime is 21113324203. The next prime is 21113324249. The reversal of 21113324213 is 31242331112.

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 10721152849 + 10392171364 = 103543^2 + 101942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113324213 - 2¹² = 21113320117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113324203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128456 + ... + 242337.

It is an arithmetic number, because the mean of its divisors is an integer number (5278437987).

Almost surely, 2^21113324213 is an apocalyptic number.

It is an amenable number.

21113324213 is a deficient number, since it is larger than the sum of its proper divisors (427735).

21113324213 is an equidigital number, since it uses as much as digits as its factorization.

21113324213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427734.

The product of its digits is 864, while the sum is 23.

Adding to 21113324213 its reverse (31242331112), we get a palindrome (52355655325).

The spelling of 21113324213 in words is "twenty-one billion, one hundred thirteen million, three hundred twenty-four thousand, two hundred thirteen".