12421434340 has 36 divisors (see below), whose sum is σ = 30343791996. Its totient is φ = 4258777152.

The previous prime is 12421434241. The next prime is 12421434379. The reversal of 12421434340 is 4343412421.

It can be written as a sum of positive squares in 2 ways, for example, as 4061257984 + 8360176356 = 63728^2 + 91434^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 12421434299 and 12421434308.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6336487 + ... + 6338446.

It is an arithmetic number, because the mean of its divisors is an integer number (842883111).

Almost surely, 2^12421434340 is an apocalyptic number.

12421434340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12421434340 is an abundant number, since it is smaller than the sum of its proper divisors (17922357656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12421434340 is a wasteful number, since it uses less digits than its factorization.

12421434340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12674956 (or 12674947 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 12421434340 its reverse (4343412421), we get a palindrome (16764846761).

The spelling of 12421434340 in words is "twelve billion, four hundred twenty-one million, four hundred thirty-four thousand, three hundred forty".