21202118683 has 2 divisors, whose sum is σ = 21202118684. Its totient is φ = 21202118682.

The previous prime is 21202118669. The next prime is 21202118731. The reversal of 21202118683 is 38681120212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202118683 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202118653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601059341 + 10601059342.

It is an arithmetic number, because the mean of its divisors is an integer number (10601059342).

Almost surely, 2^21202118683 is an apocalyptic number.

21202118683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202118683 is an equidigital number, since it uses as much as digits as its factorization.

21202118683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

Adding to 21202118683 its reverse (38681120212), we get a palindrome (59883238895).

The spelling of 21202118683 in words is "twenty-one billion, two hundred two million, one hundred eighteen thousand, six hundred eighty-three".