12213420421 has 6 divisors (see below), whose sum is σ = 12282065222. Its totient is φ = 12145157160.

The previous prime is 12213420409. The next prime is 12213420433. The reversal of 12213420421 is 12402431221.

12213420421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12213420409) and next prime (12213420433).

It can be written as a sum of positive squares in only one way, i.e., 6957895396 + 5255525025 = 83414^2 + 72495^2 .

It is not a de Polignac number, because 12213420421 - 2⁵ = 12213420389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213420392 and 12213420401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213420451) 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 5 ways as a sum of consecutive naturals, for example, 158550 + ... + 222631.

Almost surely, 2^12213420421 is an apocalyptic number.

It is an amenable number.

12213420421 is a deficient number, since it is larger than the sum of its proper divisors (68644801).

12213420421 is an frugal number, since it uses more digits than its factorization.

12213420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381539 (or 381360 counting only the distinct ones).

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

Adding to 12213420421 its reverse (12402431221), we get a palindrome (24615851642).

The spelling of 12213420421 in words is "twelve billion, two hundred thirteen million, four hundred twenty thousand, four hundred twenty-one".