21220344302197 has 2 divisors, whose sum is σ = 21220344302198. Its totient is φ = 21220344302196.

The previous prime is 21220344302191. The next prime is 21220344302219. The reversal of 21220344302197 is 79120344302212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21099011209956 + 121333092241 = 4593366^2 + 348329^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220344302197 - 2¹⁵ = 21220344269429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220344302191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610172151098 + 10610172151099.

It is an arithmetic number, because the mean of its divisors is an integer number (10610172151099).

Almost surely, 2^{21220344302197} is an apocalyptic number.

It is an amenable number.

21220344302197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220344302197 is an equidigital number, since it uses as much as digits as its factorization.

21220344302197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 21220344302197 in words is "twenty-one trillion, two hundred twenty billion, three hundred forty-four million, three hundred two thousand, one hundred ninety-seven".