2155104321 has 8 divisors (see below), whose sum is σ = 2912835360. Its totient is φ = 1417054752.

The previous prime is 2155104313. The next prime is 2155104377. The reversal of 2155104321 is 1234015512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155104321 - 2³ = 2155104313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155104291 and 2155104300.

It is not an unprimeable number, because it can be changed into a prime (2155102321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4920111 + ... + 4920548.

It is an arithmetic number, because the mean of its divisors is an integer number (364104420).

Almost surely, 2^2155104321 is an apocalyptic number.

It is an amenable number.

2155104321 is a deficient number, since it is larger than the sum of its proper divisors (757731039).

2155104321 is an equidigital number, since it uses as much as digits as its factorization.

2155104321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840735.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2155104321 is about 46423.1011566440. The cubic root of 2155104321 is about 1291.6834622267.

Adding to 2155104321 its reverse (1234015512), we get a palindrome (3389119833).

The spelling of 2155104321 in words is "two billion, one hundred fifty-five million, one hundred four thousand, three hundred twenty-one".