421432503421 has 4 divisors (see below), whose sum is σ = 421434524700. Its totient is φ = 421430482144.

The previous prime is 421432503419. The next prime is 421432503449. The reversal of 421432503421 is 124305234124.

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 164662277796 + 256770225625 = 405786^2 + 506725^2 .

It is a cyclic number.

It is not a de Polignac number, because 421432503421 - 2¹ = 421432503419 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 (421432503491) 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, 656536 + ... + 1128673.

It is an arithmetic number, because the mean of its divisors is an integer number (105358631175).

Almost surely, 2^421432503421 is an apocalyptic number.

It is an amenable number.

421432503421 is a deficient number, since it is larger than the sum of its proper divisors (2021279).

421432503421 is a wasteful number, since it uses less digits than its factorization.

421432503421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021278.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 421432503421 its reverse (124305234124), we get a palindrome (545737737545).

The spelling of 421432503421 in words is "four hundred twenty-one billion, four hundred thirty-two million, five hundred three thousand, four hundred twenty-one".