2121360012565 has 8 divisors (see below), whose sum is σ = 2545644257280. Its totient is φ = 1697079848592.

The previous prime is 2121360012533. The next prime is 2121360012593. The reversal of 2121360012565 is 5652100631212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121360012565 - 2⁵ = 2121360012533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121360012565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272356 + ... + 2077714.

It is an arithmetic number, because the mean of its divisors is an integer number (318205532160).

Almost surely, 2^{2121360012565} is an apocalyptic number.

It is an amenable number.

2121360012565 is a deficient number, since it is larger than the sum of its proper divisors (424284244715).

2121360012565 is a wasteful number, since it uses less digits than its factorization.

2121360012565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040371.

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 2121360012565 its reverse (5652100631212), we get a palindrome (7773460643777).

The spelling of 2121360012565 in words is "two trillion, one hundred twenty-one billion, three hundred sixty million, twelve thousand, five hundred sixty-five".