424222121 has 16 divisors (see below), whose sum is σ = 457002000. Its totient is φ = 392985600.

The previous prime is 424222111. The next prime is 424222129. The reversal of 424222121 is 121222424.

It can be written as a sum of positive squares in 8 ways, for example, as 157226521 + 266995600 = 12539^2 + 16340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424222121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 424222093 and 424222102.

It is not an unprimeable number, because it can be changed into a prime (424222129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69605 + ... + 75453.

It is an arithmetic number, because the mean of its divisors is an integer number (28562625).

Almost surely, 2^424222121 is an apocalyptic number.

424222121 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

424222121 is a deficient number, since it is larger than the sum of its proper divisors (32779879).

424222121 is a wasteful number, since it uses less digits than its factorization.

424222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980.

The product of its digits is 512, while the sum is 20.

The square root of 424222121 is about 20596.6531504514. The cubic root of 424222121 is about 751.3883150413.

Adding to 424222121 its reverse (121222424), we get a palindrome (545444545).

The spelling of 424222121 in words is "four hundred twenty-four million, two hundred twenty-two thousand, one hundred twenty-one".