2120042123 has 4 divisors (see below), whose sum is σ = 2130089928. Its totient is φ = 2109994320.

The previous prime is 2120042083. The next prime is 2120042143. The reversal of 2120042123 is 3212400212.

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

It is a cyclic number.

It is not a de Polignac number, because 2120042123 - 2²⁸ = 1851606667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120042143) 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, 5023586 + ... + 5024007.

It is an arithmetic number, because the mean of its divisors is an integer number (532522482).

Almost surely, 2^2120042123 is an apocalyptic number.

2120042123 is a deficient number, since it is larger than the sum of its proper divisors (10047805).

2120042123 is a wasteful number, since it uses less digits than its factorization.

2120042123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10047804.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2120042123 is about 46043.9151571627. The cubic root of 2120042123 is about 1284.6401659170.

Adding to 2120042123 its reverse (3212400212), we get a palindrome (5332442335).

The spelling of 2120042123 in words is "two billion, one hundred twenty million, forty-two thousand, one hundred twenty-three".