2001002210121 has 16 divisors (see below), whose sum is σ = 2754108730880. Its totient is φ = 1290949868160.

The previous prime is 2001002210113. The next prime is 2001002210131. The reversal of 2001002210121 is 1210122001002.

It is not a de Polignac number, because 2001002210121 - 2³ = 2001002210113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2001002210097 and 2001002210106.

It is not an unprimeable number, because it can be changed into a prime (2001002210111) 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 15 ways as a sum of consecutive naturals, for example, 8709795 + ... + 8936583.

It is an arithmetic number, because the mean of its divisors is an integer number (172131795680).

Almost surely, 2^{2001002210121} is an apocalyptic number.

It is an amenable number.

2001002210121 is a deficient number, since it is larger than the sum of its proper divisors (753106520759).

2001002210121 is a wasteful number, since it uses less digits than its factorization.

2001002210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321696.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2001002210121 its reverse (1210122001002), we get a palindrome (3211124211123).

The spelling of 2001002210121 in words is "two trillion, one billion, two million, two hundred ten thousand, one hundred twenty-one".