16206421 has 16 divisors (see below), whose sum is σ = 21086208. Its totient is φ = 12078000.

The previous prime is 16206413. The next prime is 16206433. The reversal of 16206421 is 12460261.

16206421 = T₄₁₄ + T₄₁₅ + ... + T₅₅₁.

It is not a de Polignac number, because 16206421 - 2³ = 16206413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16206392 and 16206401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16206401) 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, 2805 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (1317888).

Almost surely, 2^16206421 is an apocalyptic number.

16206421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16206421 is a deficient number, since it is larger than the sum of its proper divisors (4879787).

16206421 is a wasteful number, since it uses less digits than its factorization.

16206421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9192.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16206421 is about 4025.7199356140. The cubic root of 16206421 is about 253.0632253052.

Adding to 16206421 its reverse (12460261), we get a palindrome (28666682).

The spelling of 16206421 in words is "sixteen million, two hundred six thousand, four hundred twenty-one".