2001100261021 has 2 divisors, whose sum is σ = 2001100261022. Its totient is φ = 2001100261020.

The previous prime is 2001100261001. The next prime is 2001100261031. The reversal of 2001100261021 is 1201620011002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1284173969796 + 716926291225 = 1133214^2 + 846715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001100261021 - 2¹⁹ = 2001099736733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001100260986 and 2001100261004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001100261001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000550130510 + 1000550130511.

It is an arithmetic number, because the mean of its divisors is an integer number (1000550130511).

Almost surely, 2^{2001100261021} is an apocalyptic number.

It is an amenable number.

2001100261021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001100261021 is an equidigital number, since it uses as much as digits as its factorization.

2001100261021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2001100261021 its reverse (1201620011002), we get a palindrome (3202720272023).

The spelling of 2001100261021 in words is "two trillion, one billion, one hundred million, two hundred sixty-one thousand, twenty-one".