2120123121 has 8 divisors (see below), whose sum is σ = 2827107360. Its totient is φ = 1413277152.

The previous prime is 2120123107. The next prime is 2120123123. The reversal of 2120123121 is 1213210212.

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

It is not a de Polignac number, because 2120123121 - 2¹⁰ = 2120122097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120123121.

It is not an unprimeable number, because it can be changed into a prime (2120123123) 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, 9090 + ... + 65748.

It is an arithmetic number, because the mean of its divisors is an integer number (353388420).

Almost surely, 2^2120123121 is an apocalyptic number.

It is an amenable number.

2120123121 is a deficient number, since it is larger than the sum of its proper divisors (706984239).

2120123121 is a wasteful number, since it uses less digits than its factorization.

2120123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69135.

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

The square root of 2120123121 is about 46044.7947220964. The cubic root of 2120123121 is about 1284.6565259629.

Adding to 2120123121 its reverse (1213210212), we get a palindrome (3333333333).

The spelling of 2120123121 in words is "two billion, one hundred twenty million, one hundred twenty-three thousand, one hundred twenty-one".