12420121321144 has 64 divisors (see below), whose sum is σ = 24737339658240. Its totient is φ = 5825885038080.

The previous prime is 12420121321133. The next prime is 12420121321147. The reversal of 12420121321144 is 44112312102421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420121321147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64557397 + ... + 64749499.

It is an arithmetic number, because the mean of its divisors is an integer number (386520932160).

Almost surely, 2^{12420121321144} is an apocalyptic number.

It is an amenable number.

12420121321144 is a deficient number, since it is larger than the sum of its proper divisors (12317218337096).

12420121321144 is a wasteful number, since it uses less digits than its factorization.

12420121321144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193660 (or 193656 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 12420121321144 its reverse (44112312102421), we get a palindrome (56532433423565).

The spelling of 12420121321144 in words is "twelve trillion, four hundred twenty billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred forty-four".