21123030113 has 8 divisors (see below), whose sum is σ = 22484599200. Its totient is φ = 19786444128.

The previous prime is 21123030079. The next prime is 21123030119. The reversal of 21123030113 is 31103032112.

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 21123030113 - 2¹⁰ = 21123029089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123030091 and 21123030100.

It is not an unprimeable number, because it can be changed into a prime (21123030119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6244031 + ... + 6247412.

It is an arithmetic number, because the mean of its divisors is an integer number (2810574900).

Almost surely, 2^21123030113 is an apocalyptic number.

It is an amenable number.

21123030113 is a deficient number, since it is larger than the sum of its proper divisors (1361569087).

21123030113 is a wasteful number, since it uses less digits than its factorization.

21123030113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12491551.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21123030113 its reverse (31103032112), we get a palindrome (52226062225).

The spelling of 21123030113 in words is "twenty-one billion, one hundred twenty-three million, thirty thousand, one hundred thirteen".