21996727 has 2 divisors, whose sum is σ = 21996728. Its totient is φ = 21996726.

The previous prime is 21996707. The next prime is 21996731. The reversal of 21996727 is 72769912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21996727 - 2⁷ = 21996599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21996707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10998363 + 10998364.

It is an arithmetic number, because the mean of its divisors is an integer number (10998364).

Almost surely, 2^21996727 is an apocalyptic number.

21996727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21996727 is an equidigital number, since it uses as much as digits as its factorization.

21996727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 21996727 is about 4690.0668438733. The cubic root of 21996727 is about 280.1900368086.

The spelling of 21996727 in words is "twenty-one million, nine hundred ninety-six thousand, seven hundred twenty-seven".