21311132213 has 4 divisors (see below), whose sum is σ = 24355579680. Its totient is φ = 18266684748.

The previous prime is 21311132201. The next prime is 21311132231. The reversal of 21311132213 is 31223111312.

It is a happy number.

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 21311132213 - 2²⁰ = 21310083637 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 (21311132243) 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, 1522223723 + ... + 1522223736.

It is an arithmetic number, because the mean of its divisors is an integer number (6088894920).

Almost surely, 2^21311132213 is an apocalyptic number.

It is an amenable number.

21311132213 is a deficient number, since it is larger than the sum of its proper divisors (3044447467).

21311132213 is an equidigital number, since it uses as much as digits as its factorization.

21311132213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044447466.

The product of its digits is 216, while the sum is 20.

Adding to 21311132213 its reverse (31223111312), we get a palindrome (52534243525).

The spelling of 21311132213 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-two thousand, two hundred thirteen".