12321720941658 has 64 divisors (see below), whose sum is σ = 25745980170240. Its totient is φ = 3927810938688.

The previous prime is 12321720941617. The next prime is 12321720941669. The reversal of 12321720941658 is 85614902712321.

It is a self number, because there is not a number n which added to its sum of digits gives 12321720941658.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5609235 + ... + 7490457.

It is an arithmetic number, because the mean of its divisors is an integer number (402280940160).

It is a 1-persistent number, because it is pandigital, but 2⋅12321720941658 = 24643441883316 is not.

Almost surely, 2^{12321720941658} is an apocalyptic number.

12321720941658 is an abundant number, since it is smaller than the sum of its proper divisors (13424259228582).

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

12321720941658 is a wasteful number, since it uses less digits than its factorization.

12321720941658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881803.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 12321720941658 in words is "twelve trillion, three hundred twenty-one billion, seven hundred twenty million, nine hundred forty-one thousand, six hundred fifty-eight".