21321113203113 has 4 divisors (see below), whose sum is σ = 28428150937488. Its totient is φ = 14214075468740.

The previous prime is 21321113203109. The next prime is 21321113203123. The reversal of 21321113203113 is 31130231112312.

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 21321113203113 - 2² = 21321113203109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21321113203123) 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, 3553518867183 + ... + 3553518867188.

It is an arithmetic number, because the mean of its divisors is an integer number (7107037734372).

Almost surely, 2^{21321113203113} is an apocalyptic number.

It is an amenable number.

21321113203113 is a deficient number, since it is larger than the sum of its proper divisors (7107037734375).

21321113203113 is an equidigital number, since it uses as much as digits as its factorization.

21321113203113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107037734374.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21321113203113 its reverse (31130231112312), we get a palindrome (52451344315425).

The spelling of 21321113203113 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred thirteen million, two hundred three thousand, one hundred thirteen".