2103131221 has 8 divisors (see below), whose sum is σ = 2148471864. Its totient is φ = 2058141120.

The previous prime is 2103131167. The next prime is 2103131237. The reversal of 2103131221 is 1221313012.

It can be written as a sum of positive squares in 4 ways, for example, as 1006792900 + 1096338321 = 31730^2 + 33111^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2103131221 - 2¹⁵ = 2103098453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2103131195 and 2103131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103131291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75490 + ... + 99523.

It is an arithmetic number, because the mean of its divisors is an integer number (268558983).

Almost surely, 2^2103131221 is an apocalyptic number.

It is an amenable number.

2103131221 is a deficient number, since it is larger than the sum of its proper divisors (45340643).

2103131221 is a wasteful number, since it uses less digits than its factorization.

2103131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175271.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2103131221 is about 45859.9086457878. The cubic root of 2103131221 is about 1281.2153213505.

Adding to 2103131221 its reverse (1221313012), we get a palindrome (3324444233).

The spelling of 2103131221 in words is "two billion, one hundred three million, one hundred thirty-one thousand, two hundred twenty-one".