2121052123 has 4 divisors (see below), whose sum is σ = 2124930280. Its totient is φ = 2117173968.

The previous prime is 2121052093. The next prime is 2121052133. The reversal of 2121052123 is 3212501212.

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 2121052123 - 2⁵ = 2121052091 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121052123.

It is not an unprimeable number, because it can be changed into a prime (2121052133) 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, 1938258 + ... + 1939351.

It is an arithmetic number, because the mean of its divisors is an integer number (531232570).

Almost surely, 2^2121052123 is an apocalyptic number.

2121052123 is a deficient number, since it is larger than the sum of its proper divisors (3878157).

2121052123 is an equidigital number, since it uses as much as digits as its factorization.

2121052123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878156.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2121052123 is about 46054.8816413635. The cubic root of 2121052123 is about 1284.8441367980.

Adding to 2121052123 its reverse (3212501212), we get a palindrome (5333553335).

The spelling of 2121052123 in words is "two billion, one hundred twenty-one million, fifty-two thousand, one hundred twenty-three".