4042123212121 has 4 divisors (see below), whose sum is σ = 4043872294144. Its totient is φ = 4040374130100.

The previous prime is 4042123212019. The next prime is 4042123212233. The reversal of 4042123212121 is 1212123212404.

4042123212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4042123212121 - 2¹⁷ = 4042123081049 is a prime.

It is a super-2 number, since 2×4042123212121² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4042123212821) 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, 874537545 + ... + 874542166.

It is an arithmetic number, because the mean of its divisors is an integer number (1010968073536).

Almost surely, 2^{4042123212121} is an apocalyptic number.

It is an amenable number.

4042123212121 is a deficient number, since it is larger than the sum of its proper divisors (1749082023).

4042123212121 is a wasteful number, since it uses less digits than its factorization.

4042123212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749082022.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 4042123212121 its reverse (1212123212404), we get a palindrome (5254246424525).

The spelling of 4042123212121 in words is "four trillion, forty-two billion, one hundred twenty-three million, two hundred twelve thousand, one hundred twenty-one".