2001100222121 has 16 divisors (see below), whose sum is σ = 2686791907968. Its totient is φ = 1439352806400.

The previous prime is 2001100222097. The next prime is 2001100222123. The reversal of 2001100222121 is 1212220011002.

It is a cyclic number.

It is not a de Polignac number, because 2001100222121 - 2³⁰ = 2000026480297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001100222096 and 2001100222105.

It is not an unprimeable number, because it can be changed into a prime (2001100222123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999549560 + ... + 999551561.

It is an arithmetic number, because the mean of its divisors is an integer number (167924494248).

Almost surely, 2^{2001100222121} is an apocalyptic number.

It is an amenable number.

2001100222121 is a deficient number, since it is larger than the sum of its proper divisors (685691685847).

2001100222121 is a wasteful number, since it uses less digits than its factorization.

2001100222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999101152.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001100222121 its reverse (1212220011002), we get a palindrome (3213320233123).

The spelling of 2001100222121 in words is "two trillion, one billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-one".