21200110012217 has 2 divisors, whose sum is σ = 21200110012218. Its totient is φ = 21200110012216.

The previous prime is 21200110012177. The next prime is 21200110012223. The reversal of 21200110012217 is 71221001100212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18268580478976 + 2931529533241 = 4274176^2 + 1712171^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200110012217 - 2¹⁸ = 21200109750073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200110012117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600055006108 + 10600055006109.

It is an arithmetic number, because the mean of its divisors is an integer number (10600055006109).

Almost surely, 2^{21200110012217} is an apocalyptic number.

It is an amenable number.

21200110012217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200110012217 is an equidigital number, since it uses as much as digits as its factorization.

21200110012217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21200110012217 its reverse (71221001100212), we get a palindrome (92421111112429).

The spelling of 21200110012217 in words is "twenty-one trillion, two hundred billion, one hundred ten million, twelve thousand, two hundred seventeen".