21752699 has 2 divisors, whose sum is σ = 21752700. Its totient is φ = 21752698.

The previous prime is 21752657. The next prime is 21752719. The reversal of 21752699 is 99625712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21752699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21752609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876349 + 10876350.

It is an arithmetic number, because the mean of its divisors is an integer number (10876350).

Almost surely, 2^21752699 is an apocalyptic number.

21752699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21752699 is an equidigital number, since it uses as much as digits as its factorization.

21752699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 21752699 is about 4663.9788807412. The cubic root of 21752699 is about 279.1500543863.

The spelling of 21752699 in words is "twenty-one million, seven hundred fifty-two thousand, six hundred ninety-nine".