2130521 has 4 divisors (see below), whose sum is σ = 2180112. Its totient is φ = 2080932.

The previous prime is 2130509. The next prime is 2130523. The reversal of 2130521 is 1250312.

2130521 = 59² + 60² + ... + 187².

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2130521 - 2¹⁰ = 2129497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130496 and 2130505.

It is not an unprimeable number, because it can be changed into a prime (2130523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24731 + ... + 24816.

It is an arithmetic number, because the mean of its divisors is an integer number (545028).

2^2130521 is an apocalyptic number.

It is an amenable number.

2130521 is a deficient number, since it is larger than the sum of its proper divisors (49591).

2130521 is an equidigital number, since it uses as much as digits as its factorization.

2130521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49590.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2130521 is about 1459.6304326781. The cubic root of 2130521 is about 128.6753247803.

Adding to 2130521 its reverse (1250312), we get a palindrome (3380833).

The spelling of 2130521 in words is "two million, one hundred thirty thousand, five hundred twenty-one".