21113104113 has 32 divisors (see below), whose sum is σ = 31557265920. Its totient is φ = 13950368640.

The previous prime is 21113104109. The next prime is 21113104123. The reversal of 21113104113 is 31140131112.

It is a happy number.

It is not a de Polignac number, because 21113104113 - 2² = 21113104109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113104123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2500008 + ... + 2508438.

It is an arithmetic number, because the mean of its divisors is an integer number (986164560).

Almost surely, 2^21113104113 is an apocalyptic number.

It is an amenable number.

21113104113 is a deficient number, since it is larger than the sum of its proper divisors (10444161807).

21113104113 is a wasteful number, since it uses less digits than its factorization.

21113104113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254 (or 9248 counting only the distinct ones).

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

Adding to 21113104113 its reverse (31140131112), we get a palindrome (52253235225).

The spelling of 21113104113 in words is "twenty-one billion, one hundred thirteen million, one hundred four thousand, one hundred thirteen".