16000421 has 4 divisors (see below), whose sum is σ = 16057644. Its totient is φ = 15943200.

The previous prime is 16000409. The next prime is 16000447. The reversal of 16000421 is 12400061.

16000421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12400061 = 853 ⋅14537.

It can be written as a sum of positive squares in 2 ways, for example, as 9523396 + 6477025 = 3086^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16000421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16000396 and 16000405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16000121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28190 + ... + 28751.

It is an arithmetic number, because the mean of its divisors is an integer number (4014411).

Almost surely, 2^16000421 is an apocalyptic number.

It is an amenable number.

16000421 is a deficient number, since it is larger than the sum of its proper divisors (57223).

16000421 is an equidigital number, since it uses as much as digits as its factorization.

16000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57222.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 16000421 is about 4000.0526246538. The cubic root of 16000421 is about 251.9864200711.

Adding to 16000421 its reverse (12400061), we get a palindrome (28400482).

The spelling of 16000421 in words is "sixteen million, four hundred twenty-one", and thus it is an aban number.