4040232421 has 2 divisors, whose sum is σ = 4040232422. Its totient is φ = 4040232420.

The previous prime is 4040232389. The next prime is 4040232437. The reversal of 4040232421 is 1242320404.

It is a happy number.

4040232421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3870581796 + 169650625 = 62214^2 + 13025^2 .

It is a cyclic number.

It is not a de Polignac number, because 4040232421 - 2⁵ = 4040232389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4040232392 and 4040232401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4040232481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020116210 + 2020116211.

It is an arithmetic number, because the mean of its divisors is an integer number (2020116211).

Almost surely, 2^4040232421 is an apocalyptic number.

It is an amenable number.

4040232421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4040232421 is an equidigital number, since it uses as much as digits as its factorization.

4040232421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 4040232421 is about 63562.8226324162. The cubic root of 4040232421 is about 1592.7053899406.

Adding to 4040232421 its reverse (1242320404), we get a palindrome (5282552825).

The spelling of 4040232421 in words is "four billion, forty million, two hundred thirty-two thousand, four hundred twenty-one".