21650339 has 2 divisors, whose sum is σ = 21650340. Its totient is φ = 21650338.

The previous prime is 21650297. The next prime is 21650351. The reversal of 21650339 is 93305612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21650339 is a prime.

It is a Chen prime.

It is equal to p_1368470 and since 21650339 and 1368470 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21650389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825169 + 10825170.

It is an arithmetic number, because the mean of its divisors is an integer number (10825170).

Almost surely, 2^21650339 is an apocalyptic number.

21650339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650339 is an equidigital number, since it uses as much as digits as its factorization.

21650339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 21650339 is about 4652.9924779651. The cubic root of 21650339 is about 278.7115074842.

The spelling of 21650339 in words is "twenty-one million, six hundred fifty thousand, three hundred thirty-nine".