21704299 has 2 divisors, whose sum is σ = 21704300. Its totient is φ = 21704298.

The previous prime is 21704279. The next prime is 21704303. The reversal of 21704299 is 99240712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21704299 - 2⁷ = 21704171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21704279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10852149 + 10852150.

It is an arithmetic number, because the mean of its divisors is an integer number (10852150).

Almost surely, 2^21704299 is an apocalyptic number.

21704299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21704299 is an equidigital number, since it uses as much as digits as its factorization.

21704299 is an evil number, because the sum of its binary digits is even.

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

The square root of 21704299 is about 4658.7872885548. The cubic root of 21704299 is about 278.9428633056.

The spelling of 21704299 in words is "twenty-one million, seven hundred four thousand, two hundred ninety-nine".