121312321320 has 64 divisors (see below), whose sum is σ = 364152539520. Its totient is φ = 32330790144.

The previous prime is 121312321309. The next prime is 121312321321. The reversal of 121312321320 is 23123213121.

It is not an unprimeable number, because it can be changed into a prime (121312321321) 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, 95404 + ... + 501723.

It is an arithmetic number, because the mean of its divisors is an integer number (5689883430).

Almost surely, 2^121312321320 is an apocalyptic number.

121312321320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312321320 is an abundant number, since it is smaller than the sum of its proper divisors (242840218200).

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

121312321320 is a wasteful number, since it uses less digits than its factorization.

121312321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598834 (or 598830 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121312321320 its reverse (23123213121), we get a palindrome (144435534441).

The spelling of 121312321320 in words is "one hundred twenty-one billion, three hundred twelve million, three hundred twenty-one thousand, three hundred twenty".