12212232220021 has 4 divisors (see below), whose sum is σ = 12212247620332. Its totient is φ = 12212216819712.

The previous prime is 12212232220007. The next prime is 12212232220073. The reversal of 12212232220021 is 12002223221221.

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 4559185800625 + 7653046419396 = 2135225^2 + 2766414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212232220021 - 2⁷ = 12212232219893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212232219974 and 12212232220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212232223021) 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, 6442170 + ... + 8119483.

It is an arithmetic number, because the mean of its divisors is an integer number (3053061905083).

Almost surely, 2^{12212232220021} is an apocalyptic number.

It is an amenable number.

12212232220021 is a deficient number, since it is larger than the sum of its proper divisors (15400311).

12212232220021 is an equidigital number, since it uses as much as digits as its factorization.

12212232220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400310.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 12212232220021 its reverse (12002223221221), we get a palindrome (24214455441242).

The spelling of 12212232220021 in words is "twelve trillion, two hundred twelve billion, two hundred thirty-two million, two hundred twenty thousand, twenty-one".