2123201121 has 8 divisors (see below), whose sum is σ = 2833602240. Its totient is φ = 1414133712.

The previous prime is 2123201071. The next prime is 2123201137. The reversal of 2123201121 is 1211023212.

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

It is not a de Polignac number, because 2123201121 - 2⁷ = 2123200993 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123201121.

It is not an unprimeable number, because it can be changed into a prime (2123201141) 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, 329706 + ... + 336083.

It is an arithmetic number, because the mean of its divisors is an integer number (354200280).

Almost surely, 2^2123201121 is an apocalyptic number.

It is an amenable number.

2123201121 is a deficient number, since it is larger than the sum of its proper divisors (710401119).

2123201121 is a wasteful number, since it uses less digits than its factorization.

2123201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666855.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2123201121 is about 46078.2065731730. The cubic root of 2123201121 is about 1285.2779145244.

Adding to 2123201121 its reverse (1211023212), we get a palindrome (3334224333).

The spelling of 2123201121 in words is "two billion, one hundred twenty-three million, two hundred one thousand, one hundred twenty-one".