21311321213 has 8 divisors (see below), whose sum is σ = 26229318528. Its totient is φ = 16861704624.

The previous prime is 21311321197. The next prime is 21311321237. The reversal of 21311321213 is 31212311312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21311321213 - 2⁴ = 21311321197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311326213) 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 7 ways as a sum of consecutive naturals, for example, 117095081 + ... + 117095262.

It is an arithmetic number, because the mean of its divisors is an integer number (3278664816).

Almost surely, 2^21311321213 is an apocalyptic number.

It is an amenable number.

21311321213 is a deficient number, since it is larger than the sum of its proper divisors (4917997315).

21311321213 is a wasteful number, since it uses less digits than its factorization.

21311321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234190363.

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

Adding to 21311321213 its reverse (31212311312), we get a palindrome (52523632525).

Subtracting 21311321213 from its reverse (31212311312), we obtain a palindrome (9900990099).

The spelling of 21311321213 in words is "twenty-one billion, three hundred eleven million, three hundred twenty-one thousand, two hundred thirteen".