130521004421 has 2 divisors, whose sum is σ = 130521004422. Its totient is φ = 130521004420.

The previous prime is 130521004391. The next prime is 130521004477. The reversal of 130521004421 is 124400125031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127088685025 + 3432319396 = 356495^2 + 58586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130521004421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130521004321) 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 as a sum of consecutive naturals, namely, 65260502210 + 65260502211.

It is an arithmetic number, because the mean of its divisors is an integer number (65260502211).

Almost surely, 2^130521004421 is an apocalyptic number.

It is an amenable number.

130521004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

130521004421 is an equidigital number, since it uses as much as digits as its factorization.

130521004421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 130521004421 its reverse (124400125031), we get a palindrome (254921129452).

The spelling of 130521004421 in words is "one hundred thirty billion, five hundred twenty-one million, four thousand, four hundred twenty-one".