21819683 has 2 divisors, whose sum is σ = 21819684. Its totient is φ = 21819682.

The previous prime is 21819673. The next prime is 21819713. The reversal of 21819683 is 38691812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21819683 - 2¹⁸ = 21557539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21819643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10909841 + 10909842.

It is an arithmetic number, because the mean of its divisors is an integer number (10909842).

Almost surely, 2^21819683 is an apocalyptic number.

21819683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21819683 is an equidigital number, since it uses as much as digits as its factorization.

21819683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 21819683 is about 4671.1543541185. The cubic root of 21819683 is about 279.4362936080.

The spelling of 21819683 in words is "twenty-one million, eight hundred nineteen thousand, six hundred eighty-three".