21000231203 has 12 divisors (see below), whose sum is σ = 25216869312. Its totient is φ = 17419545360.

The previous prime is 21000231191. The next prime is 21000231209. The reversal of 21000231203 is 30213200012.

It is a happy number.

It is not a de Polignac number, because 21000231203 - 2¹⁰ = 21000230179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000231209) 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 11 ways as a sum of consecutive naturals, for example, 6911000 + ... + 6914037.

It is an arithmetic number, because the mean of its divisors is an integer number (2101405776).

Almost surely, 2^21000231203 is an apocalyptic number.

21000231203 is a deficient number, since it is larger than the sum of its proper divisors (4216638109).

21000231203 is a wasteful number, since it uses less digits than its factorization.

21000231203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13825082 (or 13825075 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000231203 its reverse (30213200012), we get a palindrome (51213431215).

The spelling of 21000231203 in words is "twenty-one billion, two hundred thirty-one thousand, two hundred three".