21000002222197 has 2 divisors, whose sum is σ = 21000002222198. Its totient is φ = 21000002222196.

The previous prime is 21000002222189. The next prime is 21000002222201. The reversal of 21000002222197 is 79122220000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12643329616516 + 8356672605681 = 3555746^2 + 2890791^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000002222197 - 2³ = 21000002222189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000002252197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001111098 + 10500001111099.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001111099).

Almost surely, 2^{21000002222197} is an apocalyptic number.

It is an amenable number.

21000002222197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002222197 is an equidigital number, since it uses as much as digits as its factorization.

21000002222197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 21000002222197 in words is "twenty-one trillion, two million, two hundred twenty-two thousand, one hundred ninety-seven".