12021100010021 has 16 divisors (see below), whose sum is σ = 12204675283824. Its totient is φ = 11838042929664.

The previous prime is 12021100009973. The next prime is 12021100010027. The reversal of 12021100010021 is 12001000112021.

It can be written as a sum of positive squares in 8 ways, for example, as 2699741461921 + 9321358548100 = 1643089^2 + 3053090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021100010021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12021100009984 and 12021100010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021100010027) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 265948595 + ... + 265993791.

It is an arithmetic number, because the mean of its divisors is an integer number (762792205239).

Almost surely, 2^{12021100010021} is an apocalyptic number.

It is an amenable number.

12021100010021 is a deficient number, since it is larger than the sum of its proper divisors (183575273803).

12021100010021 is an equidigital number, since it uses as much as digits as its factorization.

12021100010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50840.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12021100010021 its reverse (12001000112021), we get a palindrome (24022100122042).

The spelling of 12021100010021 in words is "twelve trillion, twenty-one billion, one hundred million, ten thousand, twenty-one".