21311302203 has 16 divisors (see below), whose sum is σ = 31732572960. Its totient is φ = 14135411808.

The previous prime is 21311302189. The next prime is 21311302213. The reversal of 21311302203 is 30220311312.

It is not a de Polignac number, because 21311302203 - 2⁹ = 21311301691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311302213) 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 15 ways as a sum of consecutive naturals, for example, 1998000 + ... + 2008637.

It is an arithmetic number, because the mean of its divisors is an integer number (1983285810).

Almost surely, 2^21311302203 is an apocalyptic number.

21311302203 is a deficient number, since it is larger than the sum of its proper divisors (10421270757).

21311302203 is a wasteful number, since it uses less digits than its factorization.

21311302203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006843 (or 4006837 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21311302203 its reverse (30220311312), we get a palindrome (51531613515).

The spelling of 21311302203 in words is "twenty-one billion, three hundred eleven million, three hundred two thousand, two hundred three".