21127699 has 2 divisors, whose sum is σ = 21127700. Its totient is φ = 21127698.

The previous prime is 21127679. The next prime is 21127721. The reversal of 21127699 is 99672112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21127699 - 2¹¹ = 21125651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21127609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563849 + 10563850.

It is an arithmetic number, because the mean of its divisors is an integer number (10563850).

Almost surely, 2^21127699 is an apocalyptic number.

21127699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127699 is an equidigital number, since it uses as much as digits as its factorization.

21127699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 21127699 is about 4596.4876808276. The cubic root of 21127699 is about 276.4505130924.

The spelling of 21127699 in words is "twenty-one million, one hundred twenty-seven thousand, six hundred ninety-nine".