1020121002001 has 4 divisors (see below), whose sum is σ = 1020126222900. Its totient is φ = 1020115781104.

The previous prime is 1020121001987. The next prime is 1020121002067. The reversal of 1020121002001 is 1002001210201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78879531025 + 941241470976 = 280855^2 + 970176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020121002001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020121002701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2305486 + ... + 2712103.

It is an arithmetic number, because the mean of its divisors is an integer number (255031555725).

Almost surely, 2^{1020121002001} is an apocalyptic number.

It is an amenable number.

1020121002001 is a deficient number, since it is larger than the sum of its proper divisors (5220899).

1020121002001 is an equidigital number, since it uses as much as digits as its factorization.

1020121002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220898.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1020121002001 its reverse (1002001210201), we get a palindrome (2022122212202).

The spelling of 1020121002001 in words is "one trillion, twenty billion, one hundred twenty-one million, two thousand, one".