16007421 has 24 divisors (see below), whose sum is σ = 23332000. Its totient is φ = 9752832.

The previous prime is 16007419. The next prime is 16007423. The reversal of 16007421 is 12470061.

It is an interprime number because it is at equal distance from previous prime (16007419) and next prime (16007423).

It is not a de Polignac number, because 16007421 - 2¹ = 16007419 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 (16007423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31830 + ... + 32328.

Almost surely, 2^16007421 is an apocalyptic number.

It is an amenable number.

16007421 is a deficient number, since it is larger than the sum of its proper divisors (7324579).

16007421 is a wasteful number, since it uses less digits than its factorization.

16007421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16007421 is about 4000.9275174639. The cubic root of 16007421 is about 252.0231617663.

Adding to 16007421 its reverse (12470061), we get a palindrome (28477482).

The spelling of 16007421 in words is "sixteen million, seven thousand, four hundred twenty-one".