1001220802121 has 2 divisors, whose sum is σ = 1001220802122. Its totient is φ = 1001220802120.

The previous prime is 1001220802111. The next prime is 1001220802133. The reversal of 1001220802121 is 1212080221001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622503642121 + 378717160000 = 788989^2 + 615400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001220802121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001220802093 and 1001220802102.

It is not a weakly prime, because it can be changed into another prime (1001220802111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610401060 + 500610401061.

It is an arithmetic number, because the mean of its divisors is an integer number (500610401061).

Almost surely, 2^{1001220802121} is an apocalyptic number.

It is an amenable number.

1001220802121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220802121 is an equidigital number, since it uses as much as digits as its factorization.

1001220802121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 1001220802121 in words is "one trillion, one billion, two hundred twenty million, eight hundred two thousand, one hundred twenty-one".