1001220130021 has 2 divisors, whose sum is σ = 1001220130022. Its totient is φ = 1001220130020.

The previous prime is 1001220130013. The next prime is 1001220130049. The reversal of 1001220130021 is 1200310221001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794390733796 + 206829396225 = 891286^2 + 454785^2 .

It is an emirp because it is prime and its reverse (1200310221001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001220130021 - 2³ = 1001220130013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001220129983 and 1001220130010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001220130051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610065010 + 500610065011.

It is an arithmetic number, because the mean of its divisors is an integer number (500610065011).

Almost surely, 2^{1001220130021} is an apocalyptic number.

It is an amenable number.

1001220130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220130021 is an equidigital number, since it uses as much as digits as its factorization.

1001220130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1001220130021 its reverse (1200310221001), we get a palindrome (2201530351022).

It can be divided in two parts, 1001 and 220130021, that added together give a palindrome (220131022).

The spelling of 1001220130021 in words is "one trillion, one billion, two hundred twenty million, one hundred thirty thousand, twenty-one".