21884702197 has 2 divisors, whose sum is σ = 21884702198. Its totient is φ = 21884702196.

The previous prime is 21884702183. The next prime is 21884702219. The reversal of 21884702197 is 79120748812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15948153796 + 5936548401 = 126286^2 + 77049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21884702197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21884702197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21884702297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942351098 + 10942351099.

It is an arithmetic number, because the mean of its divisors is an integer number (10942351099).

Almost surely, 2^21884702197 is an apocalyptic number.

It is an amenable number.

21884702197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884702197 is an equidigital number, since it uses as much as digits as its factorization.

21884702197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 21884702197 in words is "twenty-one billion, eight hundred eighty-four million, seven hundred two thousand, one hundred ninety-seven".