21611027 has 2 divisors, whose sum is σ = 21611028. Its totient is φ = 21611026.

The previous prime is 21611017. The next prime is 21611041. The reversal of 21611027 is 72011612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21611027 - 2⁴ = 21611011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21611017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805513 + 10805514.

It is an arithmetic number, because the mean of its divisors is an integer number (10805514).

Almost surely, 2^21611027 is an apocalyptic number.

21611027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611027 is an equidigital number, since it uses as much as digits as its factorization.

21611027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21611027 is about 4648.7661803967. The cubic root of 21611027 is about 278.5427134360.

Adding to 21611027 its reverse (72011612), we get a palindrome (93622639).

It can be divided in two parts, 216 and 11027, that multiplied together give a palindrome (2381832).

The spelling of 21611027 in words is "twenty-one million, six hundred eleven thousand, twenty-seven".