21115027 has 2 divisors, whose sum is σ = 21115028. Its totient is φ = 21115026.

The previous prime is 21115013. The next prime is 21115063. The reversal of 21115027 is 72051112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21115027 - 2¹¹ = 21112979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21114995 and 21115013.

It is not a weakly prime, because it can be changed into another prime (21115007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557513 + 10557514.

It is an arithmetic number, because the mean of its divisors is an integer number (10557514).

Almost surely, 2^21115027 is an apocalyptic number.

21115027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115027 is an equidigital number, since it uses as much as digits as its factorization.

21115027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 21115027 is about 4595.1090302625. The cubic root of 21115027 is about 276.3952320841.

Adding to 21115027 its reverse (72051112), we get a palindrome (93166139).

The spelling of 21115027 in words is "twenty-one million, one hundred fifteen thousand, twenty-seven".