1202121122221 has 2 divisors, whose sum is σ = 1202121122222. Its totient is φ = 1202121122220.

The previous prime is 1202121122203. The next prime is 1202121122249. The reversal of 1202121122221 is 1222211212021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1091212141321 + 110908980900 = 1044611^2 + 333030^2 .

It is an emirp because it is prime and its reverse (1222211212021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1202121122221 - 2³⁹ = 652365308333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202121122261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601060561110 + 601060561111.

It is an arithmetic number, because the mean of its divisors is an integer number (601060561111).

Almost surely, 2^{1202121122221} is an apocalyptic number.

It is an amenable number.

1202121122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202121122221 is an equidigital number, since it uses as much as digits as its factorization.

1202121122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1202121122221 its reverse (1222211212021), we get a palindrome (2424332334242).

The spelling of 1202121122221 in words is "one trillion, two hundred two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".