4313123021 has 4 divisors (see below), whose sum is σ = 4372206972. Its totient is φ = 4254039072.

The previous prime is 4313122999. The next prime is 4313123033. The reversal of 4313123021 is 1203213134.

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 2331537796 + 1981585225 = 48286^2 + 44515^2 .

It is a cyclic number.

It is not a de Polignac number, because 4313123021 - 2¹⁰ = 4313121997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4313122984 and 4313123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4313123051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29541866 + ... + 29542011.

It is an arithmetic number, because the mean of its divisors is an integer number (1093051743).

Almost surely, 2^4313123021 is an apocalyptic number.

It is an amenable number.

4313123021 is a deficient number, since it is larger than the sum of its proper divisors (59083951).

4313123021 is an equidigital number, since it uses as much as digits as its factorization.

4313123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59083950.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4313123021 is about 65674.3711123297. The cubic root of 4313123021 is about 1627.7858983364.

Adding to 4313123021 its reverse (1203213134), we get a palindrome (5516336155).

The spelling of 4313123021 in words is "four billion, three hundred thirteen million, one hundred twenty-three thousand, twenty-one".