21012010201073 has 2 divisors, whose sum is σ = 21012010201074. Its totient is φ = 21012010201072.

The previous prime is 21012010201069. The next prime is 21012010201153. The reversal of 21012010201073 is 37010201021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19542561965809 + 1469448235264 = 4420697^2 + 1212208^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012010201073 - 2² = 21012010201069 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012010201673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506005100536 + 10506005100537.

It is an arithmetic number, because the mean of its divisors is an integer number (10506005100537).

Almost surely, 2^{21012010201073} is an apocalyptic number.

It is an amenable number.

21012010201073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012010201073 is an equidigital number, since it uses as much as digits as its factorization.

21012010201073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21012010201073 its reverse (37010201021012), we get a palindrome (58022211222085).

The spelling of 21012010201073 in words is "twenty-one trillion, twelve billion, ten million, two hundred one thousand, seventy-three".