2165621121150 has 48 divisors (see below), whose sum is σ = 5604250840704. Its totient is φ = 552390314080.

The previous prime is 2165621121137. The next prime is 2165621121151. The reversal of 2165621121150 is 511211265612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165621121151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313854684 + ... + 313861583.

It is an arithmetic number, because the mean of its divisors is an integer number (116755225848).

Almost surely, 2^{2165621121150} is an apocalyptic number.

2165621121150 is an abundant number, since it is smaller than the sum of its proper divisors (3438629719554).

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

2165621121150 is a wasteful number, since it uses less digits than its factorization.

2165621121150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627716305 (or 627716300 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 2165621121150 its reverse (511211265612), we get a palindrome (2676832386762).

The spelling of 2165621121150 in words is "two trillion, one hundred sixty-five billion, six hundred twenty-one million, one hundred twenty-one thousand, one hundred fifty".