2121200121 has 8 divisors (see below), whose sum is σ = 2904706624. Its totient is φ = 1375913520.

The previous prime is 2121200057. The next prime is 2121200131. The reversal of 2121200121 is 1210021212.

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

It is not a de Polignac number, because 2121200121 - 2⁶ = 2121200057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121200097 and 2121200106.

It is not an unprimeable number, because it can be changed into a prime (2121200131) 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, 9554845 + ... + 9555066.

It is an arithmetic number, because the mean of its divisors is an integer number (363088328).

Almost surely, 2^2121200121 is an apocalyptic number.

It is an amenable number.

2121200121 is a deficient number, since it is larger than the sum of its proper divisors (783506503).

2121200121 is a wasteful number, since it uses less digits than its factorization.

2121200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19109951.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121200121 is about 46056.4883702611. The cubic root of 2121200121 is about 1284.8740197569.

Adding to 2121200121 its reverse (1210021212), we get a palindrome (3331221333).

The spelling of 2121200121 in words is "two billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".