21535027 has 2 divisors, whose sum is σ = 21535028. Its totient is φ = 21535026.

The previous prime is 21535001. The next prime is 21535091. The reversal of 21535027 is 72053512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21535027 - 2⁷ = 21534899 is a prime.

It is equal to p_1361644 and since 21535027 and 1361644 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 = 21534992 and 21535010.

It is not a weakly prime, because it can be changed into another prime (21595027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767513 + 10767514.

It is an arithmetic number, because the mean of its divisors is an integer number (10767514).

Almost surely, 2^21535027 is an apocalyptic number.

21535027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21535027 is an equidigital number, since it uses as much as digits as its factorization.

21535027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21535027 is about 4640.5847691859. The cubic root of 21535027 is about 278.2158107198.

Adding to 21535027 its reverse (72053512), we get a palindrome (93588539).

The spelling of 21535027 in words is "twenty-one million, five hundred thirty-five thousand, twenty-seven".