4231123021 has 4 divisors (see below), whose sum is σ = 4236896092. Its totient is φ = 4225349952.

The previous prime is 4231123003. The next prime is 4231123163. The reversal of 4231123021 is 1203211324.

It is a happy number.

4231123021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3435600996 + 795522025 = 58614^2 + 28205^2 .

It is a cyclic number.

It is not a de Polignac number, because 4231123021 - 2⁵ = 4231122989 is a prime.

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 4231123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4231123321) 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, 2885436 + ... + 2886901.

It is an arithmetic number, because the mean of its divisors is an integer number (1059224023).

Almost surely, 2^4231123021 is an apocalyptic number.

It is an amenable number.

4231123021 is a deficient number, since it is larger than the sum of its proper divisors (5773071).

4231123021 is an equidigital number, since it uses as much as digits as its factorization.

4231123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5773070.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 4231123021 is about 65047.0831090834. The cubic root of 4231123021 is about 1617.4041418332.

Adding to 4231123021 its reverse (1203211324), we get a palindrome (5434334345).

The spelling of 4231123021 in words is "four billion, two hundred thirty-one million, one hundred twenty-three thousand, twenty-one".