12421240643355 has 64 divisors (see below), whose sum is σ = 22152032202240. Its totient is φ = 5906429577216.

The previous prime is 12421240643353. The next prime is 12421240643407. The reversal of 12421240643355 is 55334604212421.

It is not a de Polignac number, because 12421240643355 - 2¹ = 12421240643353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12421240643353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81528229 + ... + 81680441.

It is an arithmetic number, because the mean of its divisors is an integer number (346125503160).

Almost surely, 2^{12421240643355} is an apocalyptic number.

12421240643355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12421240643355 is a deficient number, since it is larger than the sum of its proper divisors (9730791558885).

12421240643355 is a wasteful number, since it uses less digits than its factorization.

12421240643355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169100.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 12421240643355 its reverse (55334604212421), we get a palindrome (67755844855776).

The spelling of 12421240643355 in words is "twelve trillion, four hundred twenty-one billion, two hundred forty million, six hundred forty-three thousand, three hundred fifty-five".