21189627 has 16 divisors (see below), whose sum is σ = 31500160. Its totient is φ = 14077800.

The previous prime is 21189607. The next prime is 21189629. The reversal of 21189627 is 72698112.

21189627 is a `hidden beast` number, since 21 + 1 + 8 + 9 + 627 = 666.

It is not a de Polignac number, because 21189627 - 2²⁴ = 4412411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21189591 and 21189600.

It is not an unprimeable number, because it can be changed into a prime (21189629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7752 + ... + 10122.

It is an arithmetic number, because the mean of its divisors is an integer number (1968760).

Almost surely, 2^21189627 is an apocalyptic number.

21189627 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21189627 is a deficient number, since it is larger than the sum of its proper divisors (10310533).

21189627 is a wasteful number, since it uses less digits than its factorization.

21189627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711 (or 2705 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 21189627 is about 4603.2191996471. The cubic root of 21189627 is about 276.7203536078.

The spelling of 21189627 in words is "twenty-one million, one hundred eighty-nine thousand, six hundred twenty-seven".