21041827 has 2 divisors, whose sum is σ = 21041828. Its totient is φ = 21041826.

The previous prime is 21041821. The next prime is 21041857. The reversal of 21041827 is 72814012.

It is a happy number.

21041827 is nontrivially palindromic in base 5.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520913 + 10520914.

It is an arithmetic number, because the mean of its divisors is an integer number (10520914).

Almost surely, 2^21041827 is an apocalyptic number.

21041827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041827 is an equidigital number, since it uses as much as digits as its factorization.

21041827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21041827 is about 4587.1371246127. The cubic root of 21041827 is about 276.0754668308.

Adding to 21041827 its reverse (72814012), we get a palindrome (93855839).

The spelling of 21041827 in words is "twenty-one million, forty-one thousand, eight hundred twenty-seven".