21311313203 has 8 divisors (see below), whose sum is σ = 22566243600. Its totient is φ = 20056529920.

The previous prime is 21311313161. The next prime is 21311313209. The reversal of 21311313203 is 30231311312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21311313203 - 2⁶ = 21311313139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311313209) 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 7 ways as a sum of consecutive naturals, for example, 433088 + ... + 479778.

It is an arithmetic number, because the mean of its divisors is an integer number (2820780450).

Almost surely, 2^21311313203 is an apocalyptic number.

21311313203 is a deficient number, since it is larger than the sum of its proper divisors (1254930397).

21311313203 is a wasteful number, since it uses less digits than its factorization.

21311313203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73557.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21311313203 its reverse (30231311312), we get a palindrome (51542624515).

The spelling of 21311313203 in words is "twenty-one billion, three hundred eleven million, three hundred thirteen thousand, two hundred three".