1001012021021 has 2 divisors, whose sum is σ = 1001012021022. Its totient is φ = 1001012021020.

The previous prime is 1001012020999. The next prime is 1001012021059. The reversal of 1001012021021 is 1201202101001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847670076100 + 153341944921 = 920690^2 + 391589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001012021021 - 2²² = 1001007826717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001012020993 and 1001012021011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001012021081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500506010510 + 500506010511.

It is an arithmetic number, because the mean of its divisors is an integer number (500506010511).

Almost surely, 2^{1001012021021} is an apocalyptic number.

It is an amenable number.

1001012021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001012021021 is an equidigital number, since it uses as much as digits as its factorization.

1001012021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001012021021 its reverse (1201202101001), we get a palindrome (2202214122022).

The spelling of 1001012021021 in words is "one trillion, one billion, twelve million, twenty-one thousand, twenty-one".