421223421 has 8 divisors (see below), whose sum is σ = 561756640. Its totient is φ = 280752912.

The previous prime is 421223371. The next prime is 421223441. The reversal of 421223421 is 124322124.

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

It is not a de Polignac number, because 421223421 - 2¹⁴ = 421207037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421223441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3270 + ... + 29208.

It is an arithmetic number, because the mean of its divisors is an integer number (70219580).

Almost surely, 2^421223421 is an apocalyptic number.

It is an amenable number.

421223421 is a deficient number, since it is larger than the sum of its proper divisors (140533219).

421223421 is a wasteful number, since it uses less digits than its factorization.

421223421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31355.

The product of its digits is 768, while the sum is 21.

The square root of 421223421 is about 20523.7282431823. The cubic root of 421223421 is about 749.6136801546.

Adding to 421223421 its reverse (124322124), we get a palindrome (545545545).

The spelling of 421223421 in words is "four hundred twenty-one million, two hundred twenty-three thousand, four hundred twenty-one".