21474165 has 16 divisors (see below), whose sum is σ = 35467776. Its totient is φ = 11083200.

The previous prime is 21474143. The next prime is 21474217. The reversal of 21474165 is 56147412.

It is not a de Polignac number, because 21474165 - 2⁵ = 21474133 is a prime.

It is a super-2 number, since 2×21474165² = 922279524894450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22626 + ... + 23555.

It is an arithmetic number, because the mean of its divisors is an integer number (2216736).

Almost surely, 2^21474165 is an apocalyptic number.

It is an amenable number.

21474165 is a deficient number, since it is larger than the sum of its proper divisors (13993611).

21474165 is a wasteful number, since it uses less digits than its factorization.

21474165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46220.

The product of its digits is 6720, while the sum is 30.

The square root of 21474165 is about 4634.0225506573. The cubic root of 21474165 is about 277.9534668418.

The spelling of 21474165 in words is "twenty-one million, four hundred seventy-four thousand, one hundred sixty-five".