16435421 has 4 divisors (see below), whose sum is σ = 16443552. Its totient is φ = 16427292.

The previous prime is 16435387. The next prime is 16435469. The reversal of 16435421 is 12453461.

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: 12453461 = 1583 ⋅7867.

It is a cyclic number.

It is not a de Polignac number, because 16435421 - 2¹⁸ = 16173277 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 (16435021) 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, 1586 + ... + 5948.

It is an arithmetic number, because the mean of its divisors is an integer number (4110888).

Almost surely, 2^16435421 is an apocalyptic number.

It is an amenable number.

16435421 is a deficient number, since it is larger than the sum of its proper divisors (8131).

16435421 is an equidigital number, since it uses as much as digits as its factorization.

16435421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130.

The product of its digits is 2880, while the sum is 26.

The square root of 16435421 is about 4054.0622836853. The cubic root of 16435421 is about 254.2495996438.

Adding to 16435421 its reverse (12453461), we get a palindrome (28888882).

The spelling of 16435421 in words is "sixteen million, four hundred thirty-five thousand, four hundred twenty-one".