2151121547165 has 16 divisors (see below), whose sum is σ = 2721835206720. Its totient is φ = 1627546273920.

The previous prime is 2151121547153. The next prime is 2151121547173. The reversal of 2151121547165 is 5617451211512.

It is not a de Polignac number, because 2151121547165 - 2³⁴ = 2133941677981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19231616 + ... + 19343145.

It is an arithmetic number, because the mean of its divisors is an integer number (170114700420).

Almost surely, 2^{2151121547165} is an apocalyptic number.

It is an amenable number.

2151121547165 is a deficient number, since it is larger than the sum of its proper divisors (570713659555).

2151121547165 is a wasteful number, since it uses less digits than its factorization.

2151121547165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38575372.

The product of its digits is 84000, while the sum is 41.

Adding to 2151121547165 its reverse (5617451211512), we get a palindrome (7768572758677).

The spelling of 2151121547165 in words is "two trillion, one hundred fifty-one billion, one hundred twenty-one million, five hundred forty-seven thousand, one hundred sixty-five".