16122421 has 12 divisors (see below), whose sum is σ = 18887520. Its totient is φ = 13721400.

The previous prime is 16122413. The next prime is 16122427. The reversal of 16122421 is 12422161.

It is not a de Polignac number, because 16122421 - 2³ = 16122413 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 (16122427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6310 + ... + 8488.

It is an arithmetic number, because the mean of its divisors is an integer number (1573960).

Almost surely, 2^16122421 is an apocalyptic number.

It is an amenable number.

16122421 is a deficient number, since it is larger than the sum of its proper divisors (2765099).

16122421 is a wasteful number, since it uses less digits than its factorization.

16122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2337 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 16122421 is about 4015.2734651578. The cubic root of 16122421 is about 252.6252477999.

Adding to 16122421 its reverse (12422161), we get a palindrome (28544582).

The spelling of 16122421 in words is "sixteen million, one hundred twenty-two thousand, four hundred twenty-one".