421224443 has 4 divisors (see below), whose sum is σ = 429172128. Its totient is φ = 413276760.

The previous prime is 421224413. The next prime is 421224473. The reversal of 421224443 is 344422124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (421224413) and next prime (421224473).

It is a cyclic number.

It is not a de Polignac number, because 421224443 - 2²⁶ = 354115579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421224403) 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, 3973763 + ... + 3973868.

It is an arithmetic number, because the mean of its divisors is an integer number (107293032).

Almost surely, 2^421224443 is an apocalyptic number.

421224443 is a deficient number, since it is larger than the sum of its proper divisors (7947685).

421224443 is an equidigital number, since it uses as much as digits as its factorization.

421224443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7947684.

The product of its digits is 6144, while the sum is 26.

The square root of 421224443 is about 20523.7531411777. The cubic root of 421224443 is about 749.6142864081.

Adding to 421224443 its reverse (344422124), we get a palindrome (765646567).

The spelling of 421224443 in words is "four hundred twenty-one million, two hundred twenty-four thousand, four hundred forty-three".