130220321821 has 2 divisors, whose sum is σ = 130220321822. Its totient is φ = 130220321820.

The previous prime is 130220321797. The next prime is 130220321837. The reversal of 130220321821 is 128123022031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116426993796 + 13793328025 = 341214^2 + 117445^2 .

It is a cyclic number.

It is not a de Polignac number, because 130220321821 - 2¹¹ = 130220319773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130220322821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65110160910 + 65110160911.

It is an arithmetic number, because the mean of its divisors is an integer number (65110160911).

Almost surely, 2^130220321821 is an apocalyptic number.

It is an amenable number.

130220321821 is a deficient number, since it is larger than the sum of its proper divisors (1).

130220321821 is an equidigital number, since it uses as much as digits as its factorization.

130220321821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 130220321821 its reverse (128123022031), we get a palindrome (258343343852).

The spelling of 130220321821 in words is "one hundred thirty billion, two hundred twenty million, three hundred twenty-one thousand, eight hundred twenty-one".