12210200021 has 4 divisors (see below), whose sum is σ = 12241589100. Its totient is φ = 12178810944.

The previous prime is 12210199987. The next prime is 12210200027. The reversal of 12210200021 is 12000201221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000201221 = 43 ⋅279074447.

It can be written as a sum of positive squares in 2 ways, for example, as 6953224996 + 5256975025 = 83386^2 + 72505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12210200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210199975 and 12210200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210200027) 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, 15693956 + ... + 15694733.

It is an arithmetic number, because the mean of its divisors is an integer number (3060397275).

Almost surely, 2^12210200021 is an apocalyptic number.

It is an amenable number.

12210200021 is a deficient number, since it is larger than the sum of its proper divisors (31389079).

12210200021 is an equidigital number, since it uses as much as digits as its factorization.

12210200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31389078.

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

Adding to 12210200021 its reverse (12000201221), we get a palindrome (24210401242).

The spelling of 12210200021 in words is "twelve billion, two hundred ten million, two hundred thousand, twenty-one".