2161223214351 has 16 divisors (see below), whose sum is σ = 3033601664640. Its totient is φ = 1364845416480.

The previous prime is 2161223214343. The next prime is 2161223214377. The reversal of 2161223214351 is 1534123221612.

It is not a de Polignac number, because 2161223214351 - 2³ = 2161223214343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161223214301) 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 15 ways as a sum of consecutive naturals, for example, 1340425 + ... + 2473698.

It is an arithmetic number, because the mean of its divisors is an integer number (189600104040).

Almost surely, 2^{2161223214351} is an apocalyptic number.

2161223214351 is a deficient number, since it is larger than the sum of its proper divisors (872378450289).

2161223214351 is a wasteful number, since it uses less digits than its factorization.

2161223214351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3824086.

The product of its digits is 17280, while the sum is 33.

Adding to 2161223214351 its reverse (1534123221612), we get a palindrome (3695346435963).

The spelling of 2161223214351 in words is "two trillion, one hundred sixty-one billion, two hundred twenty-three million, two hundred fourteen thousand, three hundred fifty-one".