21253627 has 2 divisors, whose sum is σ = 21253628. Its totient is φ = 21253626.

The previous prime is 21253613. The next prime is 21253649. The reversal of 21253627 is 72635212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21253627 - 2⁷ = 21253499 is a prime.

It is equal to p_1344934 and since 21253627 and 1344934 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21253595 and 21253604.

It is not a weakly prime, because it can be changed into another prime (21253657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626813 + 10626814.

It is an arithmetic number, because the mean of its divisors is an integer number (10626814).

Almost surely, 2^21253627 is an apocalyptic number.

21253627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253627 is an equidigital number, since it uses as much as digits as its factorization.

21253627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 21253627 is about 4610.1656152464. The cubic root of 21253627 is about 276.9986706397.

Adding to 21253627 its reverse (72635212), we get a palindrome (93888839).

The spelling of 21253627 in words is "twenty-one million, two hundred fifty-three thousand, six hundred twenty-seven".