21011230113 has 4 divisors (see below), whose sum is σ = 28014973488. Its totient is φ = 14007486740.

The previous prime is 21011230109. The next prime is 21011230147. The reversal of 21011230113 is 31103211012.

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 21011230113 - 2² = 21011230109 is a prime.

It is a super-2 number, since 2×21011230113² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011230092 and 21011230101.

It is not an unprimeable number, because it can be changed into a prime (21011230153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501871683 + ... + 3501871688.

It is an arithmetic number, because the mean of its divisors is an integer number (7003743372).

Almost surely, 2^21011230113 is an apocalyptic number.

It is an amenable number.

21011230113 is a deficient number, since it is larger than the sum of its proper divisors (7003743375).

21011230113 is an equidigital number, since it uses as much as digits as its factorization.

21011230113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003743374.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21011230113 its reverse (31103211012), we get a palindrome (52114441125).

The spelling of 21011230113 in words is "twenty-one billion, eleven million, two hundred thirty thousand, one hundred thirteen".