424212221 has 8 divisors (see below), whose sum is σ = 450962400. Its totient is φ = 397904400.

The previous prime is 424212209. The next prime is 424212233. The reversal of 424212221 is 122212424.

It is an interprime number because it is at equal distance from previous prime (424212209) and next prime (424212233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 424212193 and 424212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424212251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108611 + ... + 112448.

It is an arithmetic number, because the mean of its divisors is an integer number (56370300).

Almost surely, 2^424212221 is an apocalyptic number.

It is an amenable number.

424212221 is a deficient number, since it is larger than the sum of its proper divisors (26750179).

424212221 is a wasteful number, since it uses less digits than its factorization.

424212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221179.

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

The square root of 424212221 is about 20596.4128187410. The cubic root of 424212221 is about 751.3824699884.

Adding to 424212221 its reverse (122212424), we get a palindrome (546424645).

The spelling of 424212221 in words is "four hundred twenty-four million, two hundred twelve thousand, two hundred twenty-one".