12121202200021 has 4 divisors (see below), whose sum is σ = 12121210445344. Its totient is φ = 12121193954700.

The previous prime is 12121202199991. The next prime is 12121202200099. The reversal of 12121202200021 is 12000220212121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12121202200021 - 2³⁵ = 12086842461653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121202199968 and 12121202200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121212200021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250625 + ... + 5080006.

It is an arithmetic number, because the mean of its divisors is an integer number (3030302611336).

Almost surely, 2^{12121202200021} is an apocalyptic number.

It is an amenable number.

12121202200021 is a deficient number, since it is larger than the sum of its proper divisors (8245323).

12121202200021 is an equidigital number, since it uses as much as digits as its factorization.

12121202200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8245322.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12121202200021 its reverse (12000220212121), we get a palindrome (24121422412142).

The spelling of 12121202200021 in words is "twelve trillion, one hundred twenty-one billion, two hundred two million, two hundred thousand, twenty-one".