16471421 has 4 divisors (see below), whose sum is σ = 16680000. Its totient is φ = 16262844.

The previous prime is 16471409. The next prime is 16471457. The reversal of 16471421 is 12417461.

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 an emirpimes, since its reverse is a distinct semiprime: 12417461 = 7 ⋅1773923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16471421 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 (16471121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104171 + ... + 104328.

It is an arithmetic number, because the mean of its divisors is an integer number (4170000).

Almost surely, 2^16471421 is an apocalyptic number.

It is an amenable number.

16471421 is a deficient number, since it is larger than the sum of its proper divisors (208579).

16471421 is an equidigital number, since it uses as much as digits as its factorization.

16471421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208578.

The product of its digits is 1344, while the sum is 26.

The square root of 16471421 is about 4058.4998460022. The cubic root of 16471421 is about 254.4350996245.

Adding to 16471421 its reverse (12417461), we get a palindrome (28888882).

The spelling of 16471421 in words is "sixteen million, four hundred seventy-one thousand, four hundred twenty-one".