2163154321 has 4 divisors (see below), whose sum is σ = 2176932532. Its totient is φ = 2149376112.

The previous prime is 2163154309. The next prime is 2163154333. The reversal of 2163154321 is 1234513612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2163154309) and next prime (2163154333).

It can be written as a sum of positive squares in 2 ways, for example, as 454158721 + 1708995600 = 21311^2 + 41340^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163154321 - 2²⁵ = 2129599889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2163154321.

It is not an unprimeable number, because it can be changed into a prime (2163154361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6888870 + ... + 6889183.

It is an arithmetic number, because the mean of its divisors is an integer number (544233133).

Almost surely, 2^2163154321 is an apocalyptic number.

It is an amenable number.

2163154321 is a deficient number, since it is larger than the sum of its proper divisors (13778211).

2163154321 is a wasteful number, since it uses less digits than its factorization.

2163154321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778210.

The product of its digits is 4320, while the sum is 28.

The square root of 2163154321 is about 46509.7228652246. The cubic root of 2163154321 is about 1293.2897467258.

Adding to 2163154321 its reverse (1234513612), we get a palindrome (3397667933).

The spelling of 2163154321 in words is "two billion, one hundred sixty-three million, one hundred fifty-four thousand, three hundred twenty-one".