16223421 has 8 divisors (see below), whose sum is σ = 21756960. Its totient is φ = 10752752.

The previous prime is 16223411. The next prime is 16223443. The reversal of 16223421 is 12432261.

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

It is a cyclic number.

It is not a de Polignac number, because 16223421 - 2⁷ = 16223293 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16223401) 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, 15111 + ... + 16148.

It is an arithmetic number, because the mean of its divisors is an integer number (2719620).

Almost surely, 2^16223421 is an apocalyptic number.

It is an amenable number.

16223421 is a deficient number, since it is larger than the sum of its proper divisors (5533539).

16223421 is a wasteful number, since it uses less digits than its factorization.

16223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31435.

The product of its digits is 576, while the sum is 21.

The square root of 16223421 is about 4027.8308057812. The cubic root of 16223421 is about 253.1516793705.

Adding to 16223421 its reverse (12432261), we get a palindrome (28655682).

The spelling of 16223421 in words is "sixteen million, two hundred twenty-three thousand, four hundred twenty-one".