12220210021 has 4 divisors (see below), whose sum is σ = 12220503372. Its totient is φ = 12219916672.

The previous prime is 12220210007. The next prime is 12220210027. The reversal of 12220210021 is 12001202221.

It is a happy number.

12220210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001202221 = 1741 ⋅6893281.

It can be written as a sum of positive squares in 2 ways, for example, as 7575787521 + 4644422500 = 87039^2 + 68150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220210021 - 2⁹ = 12220209509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220209983 and 12220210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71266 + ... + 171811.

It is an arithmetic number, because the mean of its divisors is an integer number (3055125843).

Almost surely, 2^12220210021 is an apocalyptic number.

It is an amenable number.

12220210021 is a deficient number, since it is larger than the sum of its proper divisors (293351).

12220210021 is an equidigital number, since it uses as much as digits as its factorization.

12220210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293350.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12220210021 its reverse (12001202221), we get a palindrome (24221412242).

The spelling of 12220210021 in words is "twelve billion, two hundred twenty million, two hundred ten thousand, twenty-one".