21627147 has 8 divisors (see below), whose sum is σ = 28996240. Its totient is φ = 14338080.

The previous prime is 21627139. The next prime is 21627157. The reversal of 21627147 is 74172612.

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

It is not a de Polignac number, because 21627147 - 2³ = 21627139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21627157) 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, 19372 + ... + 20457.

It is an arithmetic number, because the mean of its divisors is an integer number (3624530).

Almost surely, 2^21627147 is an apocalyptic number.

21627147 is a deficient number, since it is larger than the sum of its proper divisors (7369093).

21627147 is a wasteful number, since it uses less digits than its factorization.

21627147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40013.

The product of its digits is 4704, while the sum is 30.

The square root of 21627147 is about 4650.4996505752. The cubic root of 21627147 is about 278.6119526657.

Adding to 21627147 its reverse (74172612), we get a palindrome (95799759).

The spelling of 21627147 in words is "twenty-one million, six hundred twenty-seven thousand, one hundred forty-seven".