200210110021721 has 2 divisors, whose sum is σ = 200210110021722. Its totient is φ = 200210110021720.

The previous prime is 200210110021693. The next prime is 200210110021723. The reversal of 200210110021721 is 127120011012002.

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., 198808872001600 + 1401238020121 = 14099960^2 + 1183739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200210110021721 is a prime.

Together with 200210110021723, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 200210110021693 and 200210110021702.

It is not a weakly prime, because it can be changed into another prime (200210110021723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100105055010860 + 100105055010861.

It is an arithmetic number, because the mean of its divisors is an integer number (100105055010861).

Almost surely, 2^{200210110021721} is an apocalyptic number.

It is an amenable number.

200210110021721 is a deficient number, since it is larger than the sum of its proper divisors (1).

200210110021721 is an equidigital number, since it uses as much as digits as its factorization.

200210110021721 is an odious number, because the sum of its binary digits is odd.

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

Adding to 200210110021721 its reverse (127120011012002), we get a palindrome (327330121033723).

The spelling of 200210110021721 in words is "two hundred trillion, two hundred ten billion, one hundred ten million, twenty-one thousand, seven hundred twenty-one".