21627146 has 8 divisors (see below), whose sum is σ = 32460480. Its totient is φ = 10806988.

The previous prime is 21627139. The next prime is 21627157. The reversal of 21627146 is 64172612.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4505 + ... + 7971.

It is an arithmetic number, because the mean of its divisors is an integer number (4057560).

Almost surely, 2^21627146 is an apocalyptic number.

21627146 is a deficient number, since it is larger than the sum of its proper divisors (10833334).

21627146 is a wasteful number, since it uses less digits than its factorization.

21627146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6588.

The product of its digits is 4032, while the sum is 29.

The square root of 21627146 is about 4650.4995430599. The cubic root of 21627146 is about 278.6119483716.

Adding to 21627146 its reverse (64172612), we get a palindrome (85799758).

The spelling of 21627146 in words is "twenty-one million, six hundred twenty-seven thousand, one hundred forty-six".