21004627 has 8 divisors (see below), whose sum is σ = 24226400. Its totient is φ = 17838144.

The previous prime is 21004619. The next prime is 21004631. The reversal of 21004627 is 72640012.

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

It is a cyclic number.

It is not a de Polignac number, because 21004627 - 2³ = 21004619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004598 and 21004607.

It is not an unprimeable number, because it can be changed into a prime (21001627) 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, 13002 + ... + 14527.

It is an arithmetic number, because the mean of its divisors is an integer number (3028300).

Almost surely, 2^21004627 is an apocalyptic number.

21004627 is a deficient number, since it is larger than the sum of its proper divisors (3221773).

21004627 is a wasteful number, since it uses less digits than its factorization.

21004627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27645.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21004627 is about 4583.0805142393. The cubic root of 21004627 is about 275.9126789154.

Adding to 21004627 its reverse (72640012), we get a palindrome (93644639).

The spelling of 21004627 in words is "twenty-one million, four thousand, six hundred twenty-seven".