16421065 has 8 divisors (see below), whose sum is σ = 20864520. Its totient is φ = 12364032.

The previous prime is 16421063. The next prime is 16421071. The reversal of 16421065 is 56012461.

16421065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 952576 + 15468489 = 976^2 + 3933^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16421065 - 2¹ = 16421063 is a prime.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96510 + ... + 96679.

It is an arithmetic number, because the mean of its divisors is an integer number (2608065).

Almost surely, 2^16421065 is an apocalyptic number.

It is an amenable number.

16421065 is a deficient number, since it is larger than the sum of its proper divisors (4443455).

16421065 is a wasteful number, since it uses less digits than its factorization.

16421065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193211.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16421065 is about 4052.2913271383. The cubic root of 16421065 is about 254.1755508257.

The spelling of 16421065 in words is "sixteen million, four hundred twenty-one thousand, sixty-five".