4121243021 has 16 divisors (see below), whose sum is σ = 4831178880. Its totient is φ = 3442668480.

The previous prime is 4121242999. The next prime is 4121243029. The reversal of 4121243021 is 1203421214.

It is a cyclic number.

It is not a de Polignac number, because 4121243021 - 2²⁶ = 4054134157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4121242984 and 4121243002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121243029) 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, 2270 + ... + 90816.

It is an arithmetic number, because the mean of its divisors is an integer number (301948680).

Almost surely, 2^4121243021 is an apocalyptic number.

It is an amenable number.

4121243021 is a deficient number, since it is larger than the sum of its proper divisors (709935859).

4121243021 is a wasteful number, since it uses less digits than its factorization.

4121243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88724.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4121243021 is about 64196.9081887905. The cubic root of 4121243021 is about 1603.2801225948.

Adding to 4121243021 its reverse (1203421214), we get a palindrome (5324664235).

The spelling of 4121243021 in words is "four billion, one hundred twenty-one million, two hundred forty-three thousand, twenty-one".