2002001020121 has 2 divisors, whose sum is σ = 2002001020122. Its totient is φ = 2002001020120.

The previous prime is 2002001020111. The next prime is 2002001020133. The reversal of 2002001020121 is 1210201002002.

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., 1718167802521 + 283833217600 = 1310789^2 + 532760^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002001020121 - 2²² = 2001996825817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2002001020111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001000510060 + 1001000510061.

It is an arithmetic number, because the mean of its divisors is an integer number (1001000510061).

Almost surely, 2^{2002001020121} is an apocalyptic number.

It is an amenable number.

2002001020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002001020121 is an equidigital number, since it uses as much as digits as its factorization.

2002001020121 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 11.

Adding to 2002001020121 its reverse (1210201002002), we get a palindrome (3212202022123).

The spelling of 2002001020121 in words is "two trillion, two billion, one million, twenty thousand, one hundred twenty-one".