202021121100221 has 2 divisors, whose sum is σ = 202021121100222. Its totient is φ = 202021121100220.

The previous prime is 202021121100193. The next prime is 202021121100283. The reversal of 202021121100221 is 122001121120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106768615752100 + 95252505348121 = 10332890^2 + 9759739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202021121100221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202021121100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202021121100121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010560550110 + 101010560550111.

It is an arithmetic number, because the mean of its divisors is an integer number (101010560550111).

Almost surely, 2^{202021121100221} is an apocalyptic number.

It is an amenable number.

202021121100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021121100221 is an equidigital number, since it uses as much as digits as its factorization.

202021121100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202021121100221 its reverse (122001121120202), we get a palindrome (324022242220423).

The spelling of 202021121100221 in words is "two hundred two trillion, twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".