21200002097 has 2 divisors, whose sum is σ = 21200002098. Its totient is φ = 21200002096.

The previous prime is 21200002093. The next prime is 21200002151. The reversal of 21200002097 is 79020000212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20852515216 + 347486881 = 144404^2 + 18641^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200002097 - 2² = 21200002093 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200002093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600001048 + 10600001049.

It is an arithmetic number, because the mean of its divisors is an integer number (10600001049).

Almost surely, 2^21200002097 is an apocalyptic number.

It is an amenable number.

21200002097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200002097 is an equidigital number, since it uses as much as digits as its factorization.

21200002097 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 21200002097 in words is "twenty-one billion, two hundred million, two thousand, ninety-seven".