2001100120121 has 4 divisors (see below), whose sum is σ = 2001104644212. Its totient is φ = 2001095596032.

The previous prime is 2001100120109. The next prime is 2001100120133. The reversal of 2001100120121 is 1210210011002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2001100120109) and next prime (2001100120133).

It can be written as a sum of positive squares in 2 ways, for example, as 494294769721 + 1506805350400 = 703061^2 + 1227520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001100120121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001100120181) 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, 1516700 + ... + 2510493.

It is an arithmetic number, because the mean of its divisors is an integer number (500276161053).

Almost surely, 2^{2001100120121} is an apocalyptic number.

It is an amenable number.

2001100120121 is a deficient number, since it is larger than the sum of its proper divisors (4524091).

2001100120121 is an equidigital number, since it uses as much as digits as its factorization.

2001100120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001100120121 its reverse (1210210011002), we get a palindrome (3211310131123).

The spelling of 2001100120121 in words is "two trillion, one billion, one hundred million, one hundred twenty thousand, one hundred twenty-one".