21500683 has 2 divisors, whose sum is σ = 21500684. Its totient is φ = 21500682.

The previous prime is 21500681. The next prime is 21500707. The reversal of 21500683 is 38600512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21500683 - 2¹ = 21500681 is a prime.

Together with 21500681, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21500681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750341 + 10750342.

It is an arithmetic number, because the mean of its divisors is an integer number (10750342).

Almost surely, 2^21500683 is an apocalyptic number.

21500683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21500683 is an equidigital number, since it uses as much as digits as its factorization.

21500683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21500683 is about 4636.8828969470. The cubic root of 21500683 is about 278.0678327649.

The spelling of 21500683 in words is "twenty-one million, five hundred thousand, six hundred eighty-three".