1021121201801 has 2 divisors, whose sum is σ = 1021121201802. Its totient is φ = 1021121201800.

The previous prime is 1021121201791. The next prime is 1021121201819. The reversal of 1021121201801 is 1081021211201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002631729225 + 18489472576 = 1001315^2 + 135976^2 .

It is an emirp because it is prime and its reverse (1081021211201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021121201801 - 2¹⁰ = 1021121200777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021121261801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510560600900 + 510560600901.

It is an arithmetic number, because the mean of its divisors is an integer number (510560600901).

Almost surely, 2^{1021121201801} is an apocalyptic number.

It is an amenable number.

1021121201801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021121201801 is an equidigital number, since it uses as much as digits as its factorization.

1021121201801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 1021121201801 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, eight hundred one".