2101200121 has 8 divisors (see below), whose sum is σ = 2193015744. Its totient is φ = 2009422800.

The previous prime is 2101200097. The next prime is 2101200137. The reversal of 2101200121 is 1210021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101200121 - 2⁵ = 2101200089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101200098 and 2101200107.

It is not an unprimeable number, because it can be changed into a prime (2101200421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207271 + ... + 217171.

It is an arithmetic number, because the mean of its divisors is an integer number (274126968).

Almost surely, 2^2101200121 is an apocalyptic number.

It is an amenable number.

2101200121 is a deficient number, since it is larger than the sum of its proper divisors (91815623).

2101200121 is an equidigital number, since it uses as much as digits as its factorization.

2101200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19151.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2101200121 is about 45838.8494729089. The cubic root of 2101200121 is about 1280.8230629682.

Adding to 2101200121 its reverse (1210021012), we get a palindrome (3311221133).

The spelling of 2101200121 in words is "two billion, one hundred one million, two hundred thousand, one hundred twenty-one".