21110203313 has 4 divisors (see below), whose sum is σ = 21110534208. Its totient is φ = 21109872420.

The previous prime is 21110203243. The next prime is 21110203337. The reversal of 21110203313 is 31330201112.

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 21110203313 - 2⁸ = 21110203057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110203291 and 21110203300.

It is not an unprimeable number, because it can be changed into a prime (21110203343) 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, 35981 + ... + 208602.

It is an arithmetic number, because the mean of its divisors is an integer number (5277633552).

Almost surely, 2^21110203313 is an apocalyptic number.

It is an amenable number.

21110203313 is a deficient number, since it is larger than the sum of its proper divisors (330895).

21110203313 is an equidigital number, since it uses as much as digits as its factorization.

21110203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330894.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21110203313 its reverse (31330201112), we get a palindrome (52440404425).

The spelling of 21110203313 in words is "twenty-one billion, one hundred ten million, two hundred three thousand, three hundred thirteen".