12421332421 has 6 divisors (see below), whose sum is σ = 13194979730. Its totient is φ = 11690665536.

The previous prime is 12421332401. The next prime is 12421332457. The reversal of 12421332421 is 12423312421.

It can be written as a sum of positive squares in 3 ways, for example, as 1367964196 + 11053368225 = 36986^2 + 105135^2 .

It is not a de Polignac number, because 12421332421 - 2¹⁷ = 12421201349 is a prime.

It is a super-2 number, since 2×12421332421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421332401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21489906 + ... + 21490483.

Almost surely, 2^12421332421 is an apocalyptic number.

It is an amenable number.

12421332421 is a deficient number, since it is larger than the sum of its proper divisors (773647309).

12421332421 is an equidigital number, since it uses as much as digits as its factorization.

12421332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42980423 (or 42980406 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 12421332421 its reverse (12423312421), we get a palindrome (24844644842).

The spelling of 12421332421 in words is "twelve billion, four hundred twenty-one million, three hundred thirty-two thousand, four hundred twenty-one".