1220112202121 has 2 divisors, whose sum is σ = 1220112202122. Its totient is φ = 1220112202120.

The previous prime is 1220112202087. The next prime is 1220112202181. The reversal of 1220112202121 is 1212022110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217943996025 + 2168206096 = 1103605^2 + 46564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220112202121 - 2¹⁰ = 1220112201097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220112202121.

It is not a weakly prime, because it can be changed into another prime (1220112202181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610056101060 + 610056101061.

It is an arithmetic number, because the mean of its divisors is an integer number (610056101061).

Almost surely, 2^{1220112202121} is an apocalyptic number.

It is an amenable number.

1220112202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220112202121 is an equidigital number, since it uses as much as digits as its factorization.

1220112202121 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 1220112202121 its reverse (1212022110221), we get a palindrome (2432134312342).

The spelling of 1220112202121 in words is "one trillion, two hundred twenty billion, one hundred twelve million, two hundred two thousand, one hundred twenty-one".