4123340621 has 4 divisors (see below), whose sum is σ = 4125128700. Its totient is φ = 4121552544.

The previous prime is 4123340561. The next prime is 4123340629. The reversal of 4123340621 is 1260433214.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1260433214 = 2 ⋅630216607.

It can be written as a sum of positive squares in 2 ways, for example, as 1839552100 + 2283788521 = 42890^2 + 47789^2 .

It is a cyclic number.

It is not a de Polignac number, because 4123340621 - 2²⁶ = 4056231757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4123340629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890576 + ... + 895193.

It is an arithmetic number, because the mean of its divisors is an integer number (1031282175).

Almost surely, 2^4123340621 is an apocalyptic number.

It is an amenable number.

4123340621 is a deficient number, since it is larger than the sum of its proper divisors (1788079).

4123340621 is a wasteful number, since it uses less digits than its factorization.

4123340621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788078.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 4123340621 is about 64213.2433459018. The cubic root of 4123340621 is about 1603.5520850395.

Adding to 4123340621 its reverse (1260433214), we get a palindrome (5383773835).

The spelling of 4123340621 in words is "four billion, one hundred twenty-three million, three hundred forty thousand, six hundred twenty-one".