423440400421 has 4 divisors (see below), whose sum is σ = 423454531500. Its totient is φ = 423426269344.

The previous prime is 423440400389. The next prime is 423440400457. The reversal of 423440400421 is 124004044324.

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 421583997025 + 1856403396 = 649295^2 + 43086^2 .

It is a cyclic number.

It is not a de Polignac number, because 423440400421 - 2⁵ = 423440400389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 423440400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423440400121) 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, 7020496 + ... + 7080553.

It is an arithmetic number, because the mean of its divisors is an integer number (105863632875).

Almost surely, 2^423440400421 is an apocalyptic number.

It is an amenable number.

423440400421 is a deficient number, since it is larger than the sum of its proper divisors (14131079).

423440400421 is a wasteful number, since it uses less digits than its factorization.

423440400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14131078.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 423440400421 its reverse (124004044324), we get a palindrome (547444444745).

The spelling of 423440400421 in words is "four hundred twenty-three billion, four hundred forty million, four hundred thousand, four hundred twenty-one".