21268699 has 2 divisors, whose sum is σ = 21268700. Its totient is φ = 21268698.

The previous prime is 21268691. The next prime is 21268727. The reversal of 21268699 is 99686212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21268699 - 2³ = 21268691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21268691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10634349 + 10634350.

It is an arithmetic number, because the mean of its divisors is an integer number (10634350).

Almost surely, 2^21268699 is an apocalyptic number.

21268699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21268699 is an equidigital number, since it uses as much as digits as its factorization.

21268699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 21268699 is about 4611.7999739798. The cubic root of 21268699 is about 277.0641329953.

The spelling of 21268699 in words is "twenty-one million, two hundred sixty-eight thousand, six hundred ninety-nine".