21000000220012 has 24 divisors (see below), whose sum is σ = 40091047576272. Its totient is φ = 9545421772800.

The previous prime is 21000000219959. The next prime is 21000000220027. The reversal of 21000000220012 is 21002200000012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15942268 + ... + 17209180.

It is an arithmetic number, because the mean of its divisors is an integer number (1670460315678).

Almost surely, 2^{21000000220012} is an apocalyptic number.

21000000220012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000000220012 is a deficient number, since it is larger than the sum of its proper divisors (19091047356260).

21000000220012 is a wasteful number, since it uses less digits than its factorization.

21000000220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643649 (or 1643647 counting only the distinct ones).

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

Adding to 21000000220012 its reverse (21002200000012), we get a palindrome (42002200220024).

The spelling of 21000000220012 in words is "twenty-one trillion, two hundred twenty thousand, twelve".