21000220012 has 48 divisors (see below), whose sum is σ = 39624689664. Its totient is φ = 9709920000.

The previous prime is 21000220009. The next prime is 21000220019. The reversal of 21000220012 is 21002200012.

It is not an unprimeable number, because it can be changed into a prime (21000220019) 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, 3422187 + ... + 3428317.

It is an arithmetic number, because the mean of its divisors is an integer number (825514368).

Almost surely, 2^21000220012 is an apocalyptic number.

It is an amenable number.

21000220012 is a deficient number, since it is larger than the sum of its proper divisors (18624469652).

21000220012 is a wasteful number, since it uses less digits than its factorization.

21000220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390 (or 7388 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000220012 its reverse (21002200012), we get a palindrome (42002420024).

The spelling of 21000220012 in words is "twenty-one billion, two hundred twenty thousand, twelve".