1021000200221 has 2 divisors, whose sum is σ = 1021000200222. Its totient is φ = 1021000200220.

The previous prime is 1021000200203. The next prime is 1021000200223. The reversal of 1021000200221 is 1220020001201.

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., 964648087225 + 56352112996 = 982165^2 + 237386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021000200221 is a prime.

Together with 1021000200223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021000200223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510500100110 + 510500100111.

It is an arithmetic number, because the mean of its divisors is an integer number (510500100111).

Almost surely, 2^{1021000200221} is an apocalyptic number.

It is an amenable number.

1021000200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021000200221 is an equidigital number, since it uses as much as digits as its factorization.

1021000200221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1021000200221 its reverse (1220020001201), we get a palindrome (2241020201422).

It can be divided in two parts, 1021000 and 200221, that added together give a palindrome (1221221).

The spelling of 1021000200221 in words is "one trillion, twenty-one billion, two hundred thousand, two hundred twenty-one".