21020003112 has 32 divisors (see below), whose sum is σ = 52553800800. Its totient is φ = 7006161984.

The previous prime is 21020003099. The next prime is 21020003113. The reversal of 21020003112 is 21130002012.

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 (21020003113) 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 7 ways as a sum of consecutive naturals, for example, 470814 + ... + 513522.

It is an arithmetic number, because the mean of its divisors is an integer number (1642306275).

Almost surely, 2^21020003112 is an apocalyptic number.

It is an amenable number.

21020003112 is an abundant number, since it is smaller than the sum of its proper divisors (31533797688).

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

21020003112 is a wasteful number, since it uses less digits than its factorization.

21020003112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63225 (or 63221 counting only the distinct ones).

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

Adding to 21020003112 its reverse (21130002012), we get a palindrome (42150005124).

The spelling of 21020003112 in words is "twenty-one billion, twenty million, three thousand, one hundred twelve".