121212120144 has 20 divisors (see below), whose sum is σ = 313131310496. Its totient is φ = 40404040032.

The previous prime is 121212120103. The next prime is 121212120167. The reversal of 121212120144 is 441021212121.

It is a self number, because there is not a number n which added to its sum of digits gives 121212120144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262626204 + ... + 1262626299.

Almost surely, 2^121212120144 is an apocalyptic number.

It is an amenable number.

121212120144 is an abundant number, since it is smaller than the sum of its proper divisors (191919190352).

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

121212120144 is a wasteful number, since it uses less digits than its factorization.

121212120144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525252514 (or 2525252508 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121212120144 its reverse (441021212121), we get a palindrome (562233332265).

The spelling of 121212120144 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred forty-four".