2113501320221 has 4 divisors (see below), whose sum is σ = 2132891240700. Its totient is φ = 2094111399744.

The previous prime is 2113501320197. The next prime is 2113501320223. The reversal of 2113501320221 is 1220231053112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1456996257721 + 656505062500 = 1207061^2 + 810250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113501320221 - 2²² = 2113497125917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113501320223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9694960076 + ... + 9694960293.

It is an arithmetic number, because the mean of its divisors is an integer number (533222810175).

Almost surely, 2^{2113501320221} is an apocalyptic number.

It is an amenable number.

2113501320221 is a deficient number, since it is larger than the sum of its proper divisors (19389920479).

2113501320221 is a wasteful number, since it uses less digits than its factorization.

2113501320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19389920478.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 2113501320221 its reverse (1220231053112), we get a palindrome (3333732373333).

The spelling of 2113501320221 in words is "two trillion, one hundred thirteen billion, five hundred one million, three hundred twenty thousand, two hundred twenty-one".