21242331213 has 4 divisors (see below), whose sum is σ = 28323108288. Its totient is φ = 14161554140.

The previous prime is 21242331179. The next prime is 21242331223. The reversal of 21242331213 is 31213324212.

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 21242331213 - 2¹⁰ = 21242330189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242331223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3540388533 + ... + 3540388538.

It is an arithmetic number, because the mean of its divisors is an integer number (7080777072).

Almost surely, 2^21242331213 is an apocalyptic number.

It is an amenable number.

21242331213 is a deficient number, since it is larger than the sum of its proper divisors (7080777075).

21242331213 is an equidigital number, since it uses as much as digits as its factorization.

21242331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080777074.

The product of its digits is 1728, while the sum is 24.

Adding to 21242331213 its reverse (31213324212), we get a palindrome (52455655425).

The spelling of 21242331213 in words is "twenty-one billion, two hundred forty-two million, three hundred thirty-one thousand, two hundred thirteen".