1202021112221 has 2 divisors, whose sum is σ = 1202021112222. Its totient is φ = 1202021112220.

The previous prime is 1202021112157. The next prime is 1202021112241. The reversal of 1202021112221 is 1222111202021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 922512225625 + 279508886596 = 960475^2 + 528686^2 .

It is an emirp because it is prime and its reverse (1222111202021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1202021112221 - 2⁶ = 1202021112157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1202021112221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202021112241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601010556110 + 601010556111.

It is an arithmetic number, because the mean of its divisors is an integer number (601010556111).

Almost surely, 2^{1202021112221} is an apocalyptic number.

It is an amenable number.

1202021112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202021112221 is an equidigital number, since it uses as much as digits as its factorization.

1202021112221 is an evil number, because the sum of its binary digits is even.

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

Adding to 1202021112221 its reverse (1222111202021), we get a palindrome (2424132314242).

The spelling of 1202021112221 in words is "one trillion, two hundred two billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".