21101203313 has 4 divisors (see below), whose sum is σ = 21103162368. Its totient is φ = 21099244260.

The previous prime is 21101203307. The next prime is 21101203339. The reversal of 21101203313 is 31330210112.

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 21101203313 - 2⁴ = 21101203297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101203291 and 21101203300.

It is not an unprimeable number, because it can be changed into a prime (21101293313) 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, 963281 + ... + 984942.

It is an arithmetic number, because the mean of its divisors is an integer number (5275790592).

Almost surely, 2^21101203313 is an apocalyptic number.

It is an amenable number.

21101203313 is a deficient number, since it is larger than the sum of its proper divisors (1959055).

21101203313 is a wasteful number, since it uses less digits than its factorization.

21101203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959054.

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

Adding to 21101203313 its reverse (31330210112), we get a palindrome (52431413425).

The spelling of 21101203313 in words is "twenty-one billion, one hundred one million, two hundred three thousand, three hundred thirteen".