40443234421 has 2 divisors, whose sum is σ = 40443234422. Its totient is φ = 40443234420.

The previous prime is 40443234401. The next prime is 40443234427. The reversal of 40443234421 is 12443234404.

40443234421 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., 32784534225 + 7658700196 = 181065^2 + 87514^2 .

It is a cyclic number.

It is not a de Polignac number, because 40443234421 - 2⁵ = 40443234389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40443234427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221617210 + 20221617211.

It is an arithmetic number, because the mean of its divisors is an integer number (20221617211).

Almost surely, 2^40443234421 is an apocalyptic number.

It is an amenable number.

40443234421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443234421 is an equidigital number, since it uses as much as digits as its factorization.

40443234421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 40443234421 its reverse (12443234404), we get a palindrome (52886468825).

The spelling of 40443234421 in words is "forty billion, four hundred forty-three million, two hundred thirty-four thousand, four hundred twenty-one".