21220012010000 has 50 divisors (see below), whose sum is σ = 51375771101622. Its totient is φ = 8488004800000.

The previous prime is 21220012009997. The next prime is 21220012010023. The reversal of 21220012010000 is 1021002212.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 11486785094656 + 9733226915344 = 3389216^2 + 3119812^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1060990601 + ... + 1061010600.

Almost surely, 2^{21220012010000} is an apocalyptic number.

21220012010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220012010000 is an abundant number, since it is smaller than the sum of its proper divisors (30155759091622).

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

21220012010000 is an equidigital number, since it uses as much as digits as its factorization.

21220012010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122001229 (or 2122001208 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220012010000 its reverse (1021002212), we get a palindrome (21221033012212).

The spelling of 21220012010000 in words is "twenty-one trillion, two hundred twenty billion, twelve million, ten thousand".