16421069 has 4 divisors (see below), whose sum is σ = 18766944. Its totient is φ = 14075196.

The previous prime is 16421063. The next prime is 16421071. The reversal of 16421069 is 96012461.

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.

It is a cyclic number.

It is not a de Polignac number, because 16421069 - 2¹² = 16416973 is a prime.

It is a super-2 number, since 2×16421069² = 539303014205522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172927 + ... + 1172940.

It is an arithmetic number, because the mean of its divisors is an integer number (4691736).

Almost surely, 2^16421069 is an apocalyptic number.

It is an amenable number.

16421069 is a deficient number, since it is larger than the sum of its proper divisors (2345875).

16421069 is an equidigital number, since it uses as much as digits as its factorization.

16421069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345874.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16421069 is about 4052.2918206862. The cubic root of 16421069 is about 254.1755714638.

The spelling of 16421069 in words is "sixteen million, four hundred twenty-one thousand, sixty-nine".