2121301727865 has 12 divisors (see below), whose sum is σ = 3676922995044. Its totient is φ = 1131360921504.

The previous prime is 2121301727819. The next prime is 2121301727917. The reversal of 2121301727865 is 5687271031212.

2121301727865 is a `hidden beast` number, since 2 + 12 + 1 + 301 + 7 + 278 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 795185959824 + 1326115768041 = 891732^2 + 1151571^2 .

It is not a de Polignac number, because 2121301727865 - 2⁸ = 2121301727609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 47140038397 = 2121301727865 / (2 + 1 + 2 + 1 + 3 + 0 + 1 + 7 + 2 + 7 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 2121301727865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23570019154 + ... + 23570019243.

It is an arithmetic number, because the mean of its divisors is an integer number (306410249587).

Almost surely, 2^{2121301727865} is an apocalyptic number.

It is an amenable number.

2121301727865 is a deficient number, since it is larger than the sum of its proper divisors (1555621267179).

2121301727865 is a wasteful number, since it uses less digits than its factorization.

2121301727865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47140038408 (or 47140038405 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 2121301727865 in words is "two trillion, one hundred twenty-one billion, three hundred one million, seven hundred twenty-seven thousand, eight hundred sixty-five".