21311000203 has 8 divisors (see below), whose sum is σ = 21479724000. Its totient is φ = 21142619328.

The previous prime is 21311000159. The next prime is 21311000219. The reversal of 21311000203 is 30200011312.

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 21311000203 - 2¹⁷ = 21310869131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311040203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39775 + ... + 210247.

It is an arithmetic number, because the mean of its divisors is an integer number (2684965500).

Almost surely, 2^21311000203 is an apocalyptic number.

21311000203 is a deficient number, since it is larger than the sum of its proper divisors (168723797).

21311000203 is a wasteful number, since it uses less digits than its factorization.

21311000203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171461.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21311000203 its reverse (30200011312), we get a palindrome (51511011515).

The spelling of 21311000203 in words is "twenty-one billion, three hundred eleven million, two hundred three", and thus it is an aban number.