21696127 has 2 divisors, whose sum is σ = 21696128. Its totient is φ = 21696126.

The previous prime is 21696121. The next prime is 21696137. The reversal of 21696127 is 72169612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21696127 - 2¹⁵ = 21663359 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21696092 and 21696101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21696121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848063 + 10848064.

It is an arithmetic number, because the mean of its divisors is an integer number (10848064).

Almost surely, 2^21696127 is an apocalyptic number.

21696127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21696127 is an equidigital number, since it uses as much as digits as its factorization.

21696127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 21696127 is about 4657.9101537063. The cubic root of 21696127 is about 278.9078501617.

The spelling of 21696127 in words is "twenty-one million, six hundred ninety-six thousand, one hundred twenty-seven".