21104527 has 2 divisors, whose sum is σ = 21104528. Its totient is φ = 21104526.

The previous prime is 21104507. The next prime is 21104543. The reversal of 21104527 is 72540112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21104527 - 2⁷ = 21104399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21104498 and 21104507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104507) 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, 10552263 + 10552264.

It is an arithmetic number, because the mean of its divisors is an integer number (10552264).

Almost surely, 2^21104527 is an apocalyptic number.

21104527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104527 is an equidigital number, since it uses as much as digits as its factorization.

21104527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21104527 is about 4593.9663690541. The cubic root of 21104527 is about 276.3494095659.

Adding to 21104527 its reverse (72540112), we get a palindrome (93644639).

The spelling of 21104527 in words is "twenty-one million, one hundred four thousand, five hundred twenty-seven".