21113223213 has 16 divisors (see below), whose sum is σ = 28934850560. Its totient is φ = 13686475824.

The previous prime is 21113223199. The next prime is 21113223217. The reversal of 21113223213 is 31232231112.

It is not a de Polignac number, because 21113223213 - 2⁵ = 21113223181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113223213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113223217) 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 15 ways as a sum of consecutive naturals, for example, 338203 + ... + 395736.

It is an arithmetic number, because the mean of its divisors is an integer number (1808428160).

Almost surely, 2^21113223213 is an apocalyptic number.

It is an amenable number.

21113223213 is a deficient number, since it is larger than the sum of its proper divisors (7821627347).

21113223213 is a wasteful number, since it uses less digits than its factorization.

21113223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734208.

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

Adding to 21113223213 its reverse (31232231112), we get a palindrome (52345454325).

The spelling of 21113223213 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty-three thousand, two hundred thirteen".