12320002421 has 8 divisors (see below), whose sum is σ = 12401354904. Its totient is φ = 12238686720.

The previous prime is 12320002403. The next prime is 12320002469. The reversal of 12320002421 is 12420002321.

It can be written as a sum of positive squares in 4 ways, for example, as 1123188196 + 11196814225 = 33514^2 + 105815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320002421 is a prime.

It is a super-2 number, since 2×12320002421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12320002421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320005421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087241 + ... + 1098513.

It is an arithmetic number, because the mean of its divisors is an integer number (1550169363).

Almost surely, 2^12320002421 is an apocalyptic number.

It is an amenable number.

12320002421 is a deficient number, since it is larger than the sum of its proper divisors (81352483).

12320002421 is a wasteful number, since it uses less digits than its factorization.

12320002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18391.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12320002421 its reverse (12420002321), we get a palindrome (24740004742).

The spelling of 12320002421 in words is "twelve billion, three hundred twenty million, two thousand, four hundred twenty-one".