21202101002197 has 2 divisors, whose sum is σ = 21202101002198. Its totient is φ = 21202101002196.

The previous prime is 21202101002189. The next prime is 21202101002221. The reversal of 21202101002197 is 79120010120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15032610050481 + 6169490951716 = 3877191^2 + 2483846^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202101002197 - 2³ = 21202101002189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202101002107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050501098 + 10601050501099.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050501099).

Almost surely, 2^{21202101002197} is an apocalyptic number.

It is an amenable number.

21202101002197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202101002197 is an equidigital number, since it uses as much as digits as its factorization.

21202101002197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 21202101002197 in words is "twenty-one trillion, two hundred two billion, one hundred one million, two thousand, one hundred ninety-seven".