21203203012 has 48 divisors (see below), whose sum is σ = 39973191552. Its totient is φ = 9804372480.

The previous prime is 21203203009. The next prime is 21203203037. The reversal of 21203203012 is 21030230212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5402883 + ... + 5406805.

It is an arithmetic number, because the mean of its divisors is an integer number (832774824).

Almost surely, 2^21203203012 is an apocalyptic number.

It is an amenable number.

21203203012 is a deficient number, since it is larger than the sum of its proper divisors (18769988540).

21203203012 is a wasteful number, since it uses less digits than its factorization.

21203203012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308 (or 5306 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21203203012 its reverse (21030230212), we get a palindrome (42233433224).

The spelling of 21203203012 in words is "twenty-one billion, two hundred three million, two hundred three thousand, twelve".