21627085 has 4 divisors (see below), whose sum is σ = 25952508. Its totient is φ = 17301664.

The previous prime is 21627079. The next prime is 21627091. The reversal of 21627085 is 58072612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21627079) and next prime (21627091).

It can be written as a sum of positive squares in 2 ways, for example, as 6245001 + 15382084 = 2499^2 + 3922^2 .

It is a cyclic number.

It is not a de Polignac number, because 21627085 - 2¹³ = 21618893 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162704 + ... + 2162713.

It is an arithmetic number, because the mean of its divisors is an integer number (6488127).

Almost surely, 2^21627085 is an apocalyptic number.

It is an amenable number.

21627085 is a deficient number, since it is larger than the sum of its proper divisors (4325423).

21627085 is an equidigital number, since it uses as much as digits as its factorization.

21627085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4325422.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 21627085 is about 4650.4929846200. The cubic root of 21627085 is about 278.6116864269.

Adding to 21627085 its reverse (58072612), we get a palindrome (79699697).

The spelling of 21627085 in words is "twenty-one million, six hundred twenty-seven thousand, eighty-five".