424012021 has 4 divisors (see below), whose sum is σ = 424080844. Its totient is φ = 423943200.

The previous prime is 424012013. The next prime is 424012027. The reversal of 424012021 is 120210424.

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 286794225 + 137217796 = 16935^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 424012021 - 2³ = 424012013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 424011986 and 424012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424012027) 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, 24150 + ... + 37831.

It is an arithmetic number, because the mean of its divisors is an integer number (106020211).

Almost surely, 2^424012021 is an apocalyptic number.

It is an amenable number.

424012021 is a deficient number, since it is larger than the sum of its proper divisors (68823).

424012021 is an equidigital number, since it uses as much as digits as its factorization.

424012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68822.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 424012021 is about 20591.5521755889. The cubic root of 424012021 is about 751.2642505116.

Adding to 424012021 its reverse (120210424), we get a palindrome (544222445).

It can be divided in two parts, 4240 and 12021, that added together give a palindrome (16261).

The spelling of 424012021 in words is "four hundred twenty-four million, twelve thousand, twenty-one".