2155101321 has 4 divisors (see below), whose sum is σ = 2873468432. Its totient is φ = 1436734212.

The previous prime is 2155101253. The next prime is 2155101341. The reversal of 2155101321 is 1231015512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2155101321 - 2¹¹ = 2155099273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155101341) 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, 359183551 + ... + 359183556.

It is an arithmetic number, because the mean of its divisors is an integer number (718367108).

Almost surely, 2^2155101321 is an apocalyptic number.

It is an amenable number.

2155101321 is a deficient number, since it is larger than the sum of its proper divisors (718367111).

2155101321 is an equidigital number, since it uses as much as digits as its factorization.

2155101321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718367110.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 2155101321 is about 46423.0688451335. The cubic root of 2155101321 is about 1291.6828628664.

Adding to 2155101321 its reverse (1231015512), we get a palindrome (3386116833).

The spelling of 2155101321 in words is "two billion, one hundred fifty-five million, one hundred one thousand, three hundred twenty-one".