422431021 has 4 divisors (see below), whose sum is σ = 422542944. Its totient is φ = 422319100.

The previous prime is 422431019. The next prime is 422431063. The reversal of 422431021 is 120134224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 422431021 - 2¹ = 422431019 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 422431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422441021) 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, 50095 + ... + 57916.

It is an arithmetic number, because the mean of its divisors is an integer number (105635736).

Almost surely, 2^422431021 is an apocalyptic number.

It is an amenable number.

422431021 is a deficient number, since it is larger than the sum of its proper divisors (111923).

422431021 is a wasteful number, since it uses less digits than its factorization.

422431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111922.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 422431021 is about 20553.1267937509. The cubic root of 422431021 is about 750.3293492768.

Adding to 422431021 its reverse (120134224), we get a palindrome (542565245).

It can be divided in two parts, 42243 and 1021, that added together give a square (43264 = 208²).

The spelling of 422431021 in words is "four hundred twenty-two million, four hundred thirty-one thousand, twenty-one".