21112727 has 2 divisors, whose sum is σ = 21112728. Its totient is φ = 21112726.

The previous prime is 21112723. The next prime is 21112733. The reversal of 21112727 is 72721112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112727 - 2² = 21112723 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556363 + 10556364.

It is an arithmetic number, because the mean of its divisors is an integer number (10556364).

Almost surely, 2^21112727 is an apocalyptic number.

21112727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112727 is an equidigital number, since it uses as much as digits as its factorization.

21112727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392, while the sum is 23.

The square root of 21112727 is about 4594.8587573504. The cubic root of 21112727 is about 276.3851960701.

Adding to 21112727 its reverse (72721112), we get a palindrome (93833839).

The spelling of 21112727 in words is "twenty-one million, one hundred twelve thousand, seven hundred twenty-seven".