21101023113 has 4 divisors (see below), whose sum is σ = 28134697488. Its totient is φ = 14067348740.

The previous prime is 21101023093. The next prime is 21101023117. The reversal of 21101023113 is 31132010112.

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 21101023113 - 2⁶ = 21101023049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101023092 and 21101023101.

It is not an unprimeable number, because it can be changed into a prime (21101023117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516837183 + ... + 3516837188.

It is an arithmetic number, because the mean of its divisors is an integer number (7033674372).

Almost surely, 2^21101023113 is an apocalyptic number.

It is an amenable number.

21101023113 is a deficient number, since it is larger than the sum of its proper divisors (7033674375).

21101023113 is an equidigital number, since it uses as much as digits as its factorization.

21101023113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033674374.

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

Adding to 21101023113 its reverse (31132010112), we get a palindrome (52233033225).

The spelling of 21101023113 in words is "twenty-one billion, one hundred one million, twenty-three thousand, one hundred thirteen".