421231071 has 4 divisors (see below), whose sum is σ = 561641432. Its totient is φ = 280820712.

The previous prime is 421231033. The next prime is 421231087. The reversal of 421231071 is 170132124.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 421231071 - 2¹⁴ = 421214687 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 (421231091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70205176 + ... + 70205181.

It is an arithmetic number, because the mean of its divisors is an integer number (140410358).

Almost surely, 2^421231071 is an apocalyptic number.

421231071 is a deficient number, since it is larger than the sum of its proper divisors (140410361).

421231071 is a wasteful number, since it uses less digits than its factorization.

421231071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140410360.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 421231071 is about 20523.9146119837. The cubic root of 421231071 is about 749.6182181342.

Adding to 421231071 its reverse (170132124), we get a palindrome (591363195).

The spelling of 421231071 in words is "four hundred twenty-one million, two hundred thirty-one thousand, seventy-one".