1001220102121 has 2 divisors, whose sum is σ = 1001220102122. Its totient is φ = 1001220102120.

The previous prime is 1001220102079. The next prime is 1001220102173. The reversal of 1001220102121 is 1212010221001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 867217250025 + 134002852096 = 931245^2 + 366064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001220102121 - 2¹⁹ = 1001219577833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001220802121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610051060 + 500610051061.

It is an arithmetic number, because the mean of its divisors is an integer number (500610051061).

Almost surely, 2^{1001220102121} is an apocalyptic number.

It is an amenable number.

1001220102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220102121 is an equidigital number, since it uses as much as digits as its factorization.

1001220102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001220102121 its reverse (1212010221001), we get a palindrome (2213230323122).

The spelling of 1001220102121 in words is "one trillion, one billion, two hundred twenty million, one hundred two thousand, one hundred twenty-one".