2001210121101 has 24 divisors (see below), whose sum is σ = 2825280774624. Its totient is φ = 1259804962080.

The previous prime is 2001210121067. The next prime is 2001210121111. The reversal of 2001210121101 is 1011210121002.

It is not a de Polignac number, because 2001210121101 - 2¹⁵ = 2001210088333 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001210121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2677030 + ... + 3341991.

It is an arithmetic number, because the mean of its divisors is an integer number (117720032276).

Almost surely, 2^{2001210121101} is an apocalyptic number.

It is an amenable number.

2001210121101 is a deficient number, since it is larger than the sum of its proper divisors (824070653523).

2001210121101 is a wasteful number, since it uses less digits than its factorization.

2001210121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6019369 (or 6019350 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2001210121101 its reverse (1011210121002), we get a palindrome (3012420242103).

Subtracting from 2001210121101 its reverse (1011210121002), we obtain a palindrome (990000000099).

The spelling of 2001210121101 in words is "two trillion, one billion, two hundred ten million, one hundred twenty-one thousand, one hundred one".