421522473 has 4 divisors (see below), whose sum is σ = 562029968. Its totient is φ = 281014980.

The previous prime is 421522471. The next prime is 421522477. The reversal of 421522473 is 374225124.

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 not a de Polignac number, because 421522473 - 2¹ = 421522471 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 421522473.

It is not an unprimeable number, because it can be changed into a prime (421522471) 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, 70253743 + ... + 70253748.

It is an arithmetic number, because the mean of its divisors is an integer number (140507492).

Almost surely, 2^421522473 is an apocalyptic number.

It is an amenable number.

421522473 is a deficient number, since it is larger than the sum of its proper divisors (140507495).

421522473 is a wasteful number, since it uses less digits than its factorization.

421522473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140507494.

The product of its digits is 13440, while the sum is 30.

The square root of 421522473 is about 20531.0124689456. The cubic root of 421522473 is about 749.7910368957.

Adding to 421522473 its reverse (374225124), we get a palindrome (795747597).

The spelling of 421522473 in words is "four hundred twenty-one million, five hundred twenty-two thousand, four hundred seventy-three".