21243311113 has 16 divisors (see below), whose sum is σ = 21986712000. Its totient is φ = 20511892800.

The previous prime is 21243311107. The next prime is 21243311137. The reversal of 21243311113 is 31111334212.

It is a cyclic number.

It is not a de Polignac number, because 21243311113 - 2²⁵ = 21209756681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243311213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3075738 + ... + 3082636.

It is an arithmetic number, because the mean of its divisors is an integer number (1374169500).

Almost surely, 2^21243311113 is an apocalyptic number.

It is an amenable number.

21243311113 is a deficient number, since it is larger than the sum of its proper divisors (743400887).

21243311113 is a wasteful number, since it uses less digits than its factorization.

21243311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752.

The product of its digits is 432, while the sum is 22.

Adding to 21243311113 its reverse (31111334212), we get a palindrome (52354645325).

The spelling of 21243311113 in words is "twenty-one billion, two hundred forty-three million, three hundred eleven thousand, one hundred thirteen".