21103203112 has 64 divisors (see below), whose sum is σ = 40406889600. Its totient is φ = 10331193600.

The previous prime is 21103203103. The next prime is 21103203137. The reversal of 21103203112 is 21130230112.

It is an unprimeable number.

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, 38579623 + ... + 38580169.

It is an arithmetic number, because the mean of its divisors is an integer number (631357650).

Almost surely, 2^21103203112 is an apocalyptic number.

It is an amenable number.

21103203112 is a deficient number, since it is larger than the sum of its proper divisors (19303686488).

21103203112 is a wasteful number, since it uses less digits than its factorization.

21103203112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21103203112 its reverse (21130230112), we get a palindrome (42233433224).

The spelling of 21103203112 in words is "twenty-one billion, one hundred three million, two hundred three thousand, one hundred twelve".