12421203550405 has 32 divisors (see below), whose sum is σ = 16486380054144. Its totient is φ = 8924389353216.

The previous prime is 12421203550337. The next prime is 12421203550559. The reversal of 12421203550405 is 50405530212421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12421203550405 - 2⁷ = 12421203550277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101629542 + ... + 101751688.

It is an arithmetic number, because the mean of its divisors is an integer number (515199376692).

Almost surely, 2^{12421203550405} is an apocalyptic number.

It is an amenable number.

12421203550405 is a deficient number, since it is larger than the sum of its proper divisors (4065176503739).

12421203550405 is a wasteful number, since it uses less digits than its factorization.

12421203550405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164485.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 12421203550405 its reverse (50405530212421), we get a palindrome (62826733762826).

The spelling of 12421203550405 in words is "twelve trillion, four hundred twenty-one billion, two hundred three million, five hundred fifty thousand, four hundred five".