21002003112 has 64 divisors (see below), whose sum is σ = 53101339200. Its totient is φ = 6921308160.

The previous prime is 21002003089. The next prime is 21002003119. The reversal of 21002003112 is 21130020012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21002003119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2535714 + ... + 2543982.

It is an arithmetic number, because the mean of its divisors is an integer number (829708425).

Almost surely, 2^21002003112 is an apocalyptic number.

It is an amenable number.

21002003112 is an abundant number, since it is smaller than the sum of its proper divisors (32099336088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002003112 is a wasteful number, since it uses less digits than its factorization.

21002003112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466 (or 9462 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002003112 its reverse (21130020012), we get a palindrome (42132023124).

The spelling of 21002003112 in words is "twenty-one billion, two million, three thousand, one hundred twelve".