21111230113 has 4 divisors (see below), whose sum is σ = 21792237568. Its totient is φ = 20430222660.

The previous prime is 21111230111. The next prime is 21111230117. The reversal of 21111230113 is 31103211112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111230113 - 2¹ = 21111230111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111230111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340503681 + ... + 340503742.

It is an arithmetic number, because the mean of its divisors is an integer number (5448059392).

Almost surely, 2^21111230113 is an apocalyptic number.

It is an amenable number.

21111230113 is a deficient number, since it is larger than the sum of its proper divisors (681007455).

21111230113 is an equidigital number, since it uses as much as digits as its factorization.

21111230113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681007454.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111230113 its reverse (31103211112), we get a palindrome (52214441225).

The spelling of 21111230113 in words is "twenty-one billion, one hundred eleven million, two hundred thirty thousand, one hundred thirteen".