1201210101001 has 2 divisors, whose sum is σ = 1201210101002. Its totient is φ = 1201210101000.

The previous prime is 1201210100989. The next prime is 1201210101031. The reversal of 1201210101001 is 1001010121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083574820601 + 117635280400 = 1040949^2 + 342980^2 .

It is an emirp because it is prime and its reverse (1001010121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201210101001 - 2⁷ = 1201210100873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201210101031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605050500 + 600605050501.

It is an arithmetic number, because the mean of its divisors is an integer number (600605050501).

Almost surely, 2^{1201210101001} is an apocalyptic number.

It is an amenable number.

1201210101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201210101001 is an equidigital number, since it uses as much as digits as its factorization.

1201210101001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1201210101001 its reverse (1001010121021), we get a palindrome (2202220222022).

The spelling of 1201210101001 in words is "one trillion, two hundred one billion, two hundred ten million, one hundred one thousand, one".