2103131521 has 2 divisors, whose sum is σ = 2103131522. Its totient is φ = 2103131520.

The previous prime is 2103131519. The next prime is 2103131561. The reversal of 2103131521 is 1251313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1596881521 + 506250000 = 39961^2 + 22500^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103131521 - 2¹ = 2103131519 is a prime.

Together with 2103131519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2103131561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051565760 + 1051565761.

It is an arithmetic number, because the mean of its divisors is an integer number (1051565761).

Almost surely, 2^2103131521 is an apocalyptic number.

It is an amenable number.

2103131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103131521 is an equidigital number, since it uses as much as digits as its factorization.

2103131521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 2103131521 is about 45859.9119166184. The cubic root of 2103131521 is about 1281.2153822699.

Adding to 2103131521 its reverse (1251313012), we get a palindrome (3354444533).

The spelling of 2103131521 in words is "two billion, one hundred three million, one hundred thirty-one thousand, five hundred twenty-one".