13121212043440 has 20 divisors (see below), whose sum is σ = 30506818001184. Its totient is φ = 5248484817344.

The previous prime is 13121212043417. The next prime is 13121212043453. The reversal of 13121212043440 is 4434021212131.

It is a happy number.

13121212043440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 13121212043399 and 13121212043408.

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, 82007575192 + ... + 82007575351.

Almost surely, 2^{13121212043440} is an apocalyptic number.

13121212043440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121212043440 is an abundant number, since it is smaller than the sum of its proper divisors (17385605957744).

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

13121212043440 is a wasteful number, since it uses less digits than its factorization.

13121212043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164015150556 (or 164015150550 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 13121212043440 its reverse (4434021212131), we get a palindrome (17555233255571).

The spelling of 13121212043440 in words is "thirteen trillion, one hundred twenty-one billion, two hundred twelve million, forty-three thousand, four hundred forty".