21002200097 has 2 divisors, whose sum is σ = 21002200098. Its totient is φ = 21002200096.

The previous prime is 21002199989. The next prime is 21002200099. The reversal of 21002200097 is 79000220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10986393856 + 10015806241 = 104816^2 + 100079^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002200097 - 2¹⁰ = 21002199073 is a prime.

Together with 21002200099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21002200099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501100048 + 10501100049.

It is an arithmetic number, because the mean of its divisors is an integer number (10501100049).

Almost surely, 2^21002200097 is an apocalyptic number.

It is an amenable number.

21002200097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002200097 is an equidigital number, since it uses as much as digits as its factorization.

21002200097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The spelling of 21002200097 in words is "twenty-one billion, two million, two hundred thousand, ninety-seven".