2001100121 has 4 divisors (see below), whose sum is σ = 2106421200. Its totient is φ = 1895779044.

The previous prime is 2001100103. The next prime is 2001100151. The reversal of 2001100121 is 1210011002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001100121 - 2¹⁰ = 2001099097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001100099 and 2001100108.

It is not an unprimeable number, because it can be changed into a prime (2001100151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52660511 + ... + 52660548.

It is an arithmetic number, because the mean of its divisors is an integer number (526605300).

Almost surely, 2^2001100121 is an apocalyptic number.

It is an amenable number.

2001100121 is a deficient number, since it is larger than the sum of its proper divisors (105321079).

2001100121 is a wasteful number, since it uses less digits than its factorization.

2001100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105321078.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2001100121 is about 44733.6575857597. The cubic root of 2001100121 is about 1260.1520184854.

Adding to 2001100121 its reverse (1210011002), we get a palindrome (3211111123).

The spelling of 2001100121 in words is "two billion, one million, one hundred thousand, one hundred twenty-one".