21312211113 has 24 divisors (see below), whose sum is σ = 31165709120. Its totient is φ = 14032841760.

The previous prime is 21312211093. The next prime is 21312211117. The reversal of 21312211113 is 31111221312.

It is not a de Polignac number, because 21312211113 - 2²⁸ = 21043775657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312211117) 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 23 ways as a sum of consecutive naturals, for example, 321003 + ... + 381663.

Almost surely, 2^21312211113 is an apocalyptic number.

It is an amenable number.

21312211113 is a deficient number, since it is larger than the sum of its proper divisors (9853498007).

21312211113 is a wasteful number, since it uses less digits than its factorization.

21312211113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61149 (or 61146 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21312211113 its reverse (31111221312), we get a palindrome (52423432425).

The spelling of 21312211113 in words is "twenty-one billion, three hundred twelve million, two hundred eleven thousand, one hundred thirteen".