21144627 has 18 divisors (see below), whose sum is σ = 35529468. Its totient is φ = 12082392.

The previous prime is 21144623. The next prime is 21144631. The reversal of 21144627 is 72644112.

21144627 is a `hidden beast` number, since 21 + 14 + 4 + 627 = 666.

It is an interprime number because it is at equal distance from previous prime (21144623) and next prime (21144631).

It is not a de Polignac number, because 21144627 - 2² = 21144623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21144627.

It is not an unprimeable number, because it can be changed into a prime (21144623) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23533 + ... + 24414.

Almost surely, 2^21144627 is an apocalyptic number.

21144627 is a deficient number, since it is larger than the sum of its proper divisors (14384841).

21144627 is a wasteful number, since it uses less digits than its factorization.

21144627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47967 (or 47957 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21144627 is about 4598.3287181323. The cubic root of 21144627 is about 276.5243262259.

Adding to 21144627 its reverse (72644112), we get a palindrome (93788739).

The spelling of 21144627 in words is "twenty-one million, one hundred forty-four thousand, six hundred twenty-seven".