4121212121 has 16 divisors (see below), whose sum is σ = 4475862720. Its totient is φ = 3772077120.

The previous prime is 4121212021. The next prime is 4121212141. The reversal of 4121212121 is 1212121214.

It is a cyclic number.

It is not a de Polignac number, because 4121212121 - 2³⁰ = 3047470297 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 4121212121.

It is not an unprimeable number, because it can be changed into a prime (4121212141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773615 + ... + 778923.

It is an arithmetic number, because the mean of its divisors is an integer number (279741420).

Almost surely, 2^4121212121 is an apocalyptic number.

It is an amenable number.

4121212121 is a deficient number, since it is larger than the sum of its proper divisors (354650599).

4121212121 is a wasteful number, since it uses less digits than its factorization.

4121212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816.

The product of its digits is 64, while the sum is 17.

The square root of 4121212121 is about 64196.6675225436. The cubic root of 4121212121 is about 1603.2761155934.

Adding to 4121212121 its reverse (1212121214), we get a palindrome (5333333335).

It can be divided in two parts, 4 and 121212121, that multiplied together give a palindrome (484848484).

The spelling of 4121212121 in words is "four billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".