130621 has 2 divisors, whose sum is σ = 130622. Its totient is φ = 130620.

The previous prime is 130619. The next prime is 130631. The reversal of 130621 is 126031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68121 + 62500 = 261^2 + 250^2 .

It is an emirp because it is prime and its reverse (126031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130621 - 2¹ = 130619 is a prime.

Together with 130619, it forms a pair of twin primes.

It is a Chen prime.

130621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65310 + 65311.

It is an arithmetic number, because the mean of its divisors is an integer number (65311).

2¹³⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

130621 is a deficient number, since it is larger than the sum of its proper divisors (1).

130621 is an equidigital number, since it uses as much as digits as its factorization.

130621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 130621 is about 361.4152736119. The cubic root of 130621 is about 50.7385051660.

Adding to 130621 its reverse (126031), we get a palindrome (256652).

The spelling of 130621 in words is "one hundred thirty thousand, six hundred twenty-one".