21204627 has 32 divisors (see below), whose sum is σ = 32025600. Its totient is φ = 12400128.

The previous prime is 21204619. The next prime is 21204641. The reversal of 21204627 is 72640212.

It is not a de Polignac number, because 21204627 - 2³ = 21204619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21204597 and 21204606.

It is not an unprimeable number, because it can be changed into a prime (21204607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76413 + ... + 76689.

It is an arithmetic number, because the mean of its divisors is an integer number (1000800).

Almost surely, 2^21204627 is an apocalyptic number.

21204627 is a deficient number, since it is larger than the sum of its proper divisors (10820973).

21204627 is a wasteful number, since it uses less digits than its factorization.

21204627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21204627 is about 4604.8482059673. The cubic root of 21204627 is about 276.7856343896.

Adding to 21204627 its reverse (72640212), we get a palindrome (93844839).

The spelling of 21204627 in words is "twenty-one million, two hundred four thousand, six hundred twenty-seven".