16226421 has 16 divisors (see below), whose sum is σ = 22266624. Its totient is φ = 10505664.

The previous prime is 16226401. The next prime is 16226429. The reversal of 16226421 is 12462261.

16226421 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 16226421 - 2¹⁷ = 16095349 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16226391 and 16226400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16226429) 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, 21771 + ... + 22503.

It is an arithmetic number, because the mean of its divisors is an integer number (1391664).

Almost surely, 2^16226421 is an apocalyptic number.

It is an amenable number.

16226421 is a deficient number, since it is larger than the sum of its proper divisors (6040203).

16226421 is a wasteful number, since it uses less digits than its factorization.

16226421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940.

The product of its digits is 1152, while the sum is 24.

The square root of 16226421 is about 4028.2031974567. The cubic root of 16226421 is about 253.1672824962.

Adding to 16226421 its reverse (12462261), we get a palindrome (28688682).

The spelling of 16226421 in words is "sixteen million, two hundred twenty-six thousand, four hundred twenty-one".