21211323213 has 8 divisors (see below), whose sum is σ = 28622508768. Its totient is φ = 13970509904.

The previous prime is 21211323193. The next prime is 21211323229. The reversal of 21211323213 is 31232311212.

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 21211323213 - 2¹⁰ = 21211322189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211323213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211323233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42592770 + ... + 42593267.

It is an arithmetic number, because the mean of its divisors is an integer number (3577813596).

Almost surely, 2^21211323213 is an apocalyptic number.

It is an amenable number.

21211323213 is a deficient number, since it is larger than the sum of its proper divisors (7411185555).

21211323213 is an equidigital number, since it uses as much as digits as its factorization.

21211323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85186123.

The product of its digits is 432, while the sum is 21.

Adding to 21211323213 its reverse (31232311212), we get a palindrome (52443634425).

The spelling of 21211323213 in words is "twenty-one billion, two hundred eleven million, three hundred twenty-three thousand, two hundred thirteen".