12212230021 has 4 divisors (see below), whose sum is σ = 12256317772. Its totient is φ = 12168142272.

The previous prime is 12212230003. The next prime is 12212230033. The reversal of 12212230021 is 12003221221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 731107521 + 11481122500 = 27039^2 + 107150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212230021 - 2⁵ = 12212229989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212229977 and 12212230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212230061) 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, 22043460 + ... + 22044013.

It is an arithmetic number, because the mean of its divisors is an integer number (3064079443).

Almost surely, 2^12212230021 is an apocalyptic number.

It is an amenable number.

12212230021 is a deficient number, since it is larger than the sum of its proper divisors (44087751).

12212230021 is an equidigital number, since it uses as much as digits as its factorization.

12212230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44087750.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12212230021 its reverse (12003221221), we get a palindrome (24215451242).

The spelling of 12212230021 in words is "twelve billion, two hundred twelve million, two hundred thirty thousand, twenty-one".