1001012000221 has 2 divisors, whose sum is σ = 1001012000222. Its totient is φ = 1001012000220.

The previous prime is 1001012000189. The next prime is 1001012000239. The reversal of 1001012000221 is 1220002101001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 596339172900 + 404672827321 = 772230^2 + 636139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001012000221 - 2⁵ = 1001012000189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001012000198 and 1001012000207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001012007221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500506000110 + 500506000111.

It is an arithmetic number, because the mean of its divisors is an integer number (500506000111).

Almost surely, 2^{1001012000221} is an apocalyptic number.

It is an amenable number.

1001012000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001012000221 is an equidigital number, since it uses as much as digits as its factorization.

1001012000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1001012000221 its reverse (1220002101001), we get a palindrome (2221014101222).

The spelling of 1001012000221 in words is "one trillion, one billion, twelve million, two hundred twenty-one", and thus it is an aban number.