16200421 has 4 divisors (see below), whose sum is σ = 16208512. Its totient is φ = 16192332.

The previous prime is 16200419. The next prime is 16200427. The reversal of 16200421 is 12400261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12400261 = 541 ⋅22921.

It is a cyclic number.

It is not a de Polignac number, because 16200421 - 2¹ = 16200419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16200395 and 16200404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16200427) 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, 1420 + ... + 5866.

It is an arithmetic number, because the mean of its divisors is an integer number (4052128).

Almost surely, 2^16200421 is an apocalyptic number.

It is an amenable number.

16200421 is a deficient number, since it is larger than the sum of its proper divisors (8091).

16200421 is an equidigital number, since it uses as much as digits as its factorization.

16200421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 16200421 is about 4024.9746583053. The cubic root of 16200421 is about 253.0319914552.

Adding to 16200421 its reverse (12400261), we get a palindrome (28600682).

The spelling of 16200421 in words is "sixteen million, two hundred thousand, four hundred twenty-one".