4140043421 has 4 divisors (see below), whose sum is σ = 4147476732. Its totient is φ = 4132610112.

The previous prime is 4140043387. The next prime is 4140043433. The reversal of 4140043421 is 1243400414.

It is a happy number.

4140043421 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, and also an emirpimes, since its reverse is a distinct semiprime: 1243400414 = 2 ⋅621700207.

It can be written as a sum of positive squares in 2 ways, for example, as 228916900 + 3911126521 = 15130^2 + 62539^2 .

It is a cyclic number.

It is not a de Polignac number, because 4140043421 - 2¹⁰ = 4140042397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4140043021) 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, 3715820 + ... + 3716933.

It is an arithmetic number, because the mean of its divisors is an integer number (1036869183).

Almost surely, 2^4140043421 is an apocalyptic number.

It is an amenable number.

4140043421 is a deficient number, since it is larger than the sum of its proper divisors (7433311).

4140043421 is an equidigital number, since it uses as much as digits as its factorization.

4140043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433310.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 4140043421 is about 64343.1691867909. The cubic root of 4140043421 is about 1605.7143872574.

Adding to 4140043421 its reverse (1243400414), we get a palindrome (5383443835).

The spelling of 4140043421 in words is "four billion, one hundred forty million, forty-three thousand, four hundred twenty-one".