21103200113 has 4 divisors (see below), whose sum is σ = 21103634148. Its totient is φ = 21102766080.

The previous prime is 21103200089. The next prime is 21103200137. The reversal of 21103200113 is 31100230112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21103200089) and next prime (21103200137).

It can be written as a sum of positive squares in 2 ways, for example, as 13236042304 + 7867157809 = 115048^2 + 88697^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103200113 - 2⁶ = 21103200049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103200163) 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, 133328 + ... + 244913.

It is an arithmetic number, because the mean of its divisors is an integer number (5275908537).

Almost surely, 2^21103200113 is an apocalyptic number.

It is an amenable number.

21103200113 is a deficient number, since it is larger than the sum of its proper divisors (434035).

21103200113 is an equidigital number, since it uses as much as digits as its factorization.

21103200113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434034.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21103200113 its reverse (31100230112), we get a palindrome (52203430225).

The spelling of 21103200113 in words is "twenty-one billion, one hundred three million, two hundred thousand, one hundred thirteen".