12121513521640 has 32 divisors (see below), whose sum is σ = 27279533302560. Its totient is φ = 4847516008000.

The previous prime is 12121513521581. The next prime is 12121513521643. The reversal of 12121513521640 is 4612531512121.

It is a junction number, because it is equal to n+sod(n) for n = 12121513521596 and 12121513521605.

It is not an unprimeable number, because it can be changed into a prime (12121513521643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33863506 + ... + 34219585.

It is an arithmetic number, because the mean of its divisors is an integer number (852485415705).

Almost surely, 2^{12121513521640} is an apocalyptic number.

12121513521640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121513521640 is an abundant number, since it is smaller than the sum of its proper divisors (15158019780920).

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

12121513521640 is a wasteful number, since it uses less digits than its factorization.

12121513521640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68087553 (or 68087549 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 12121513521640 in words is "twelve trillion, one hundred twenty-one billion, five hundred thirteen million, five hundred twenty-one thousand, six hundred forty".