1123012220221 has 2 divisors, whose sum is σ = 1123012220222. Its totient is φ = 1123012220220.

The previous prime is 1123012220219. The next prime is 1123012220293. The reversal of 1123012220221 is 1220222103211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 868597904196 + 254414316025 = 931986^2 + 504395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123012220221 - 2¹ = 1123012220219 is a prime.

It is a super-2 number, since 2×1123012220221² (a number of 25 digits) contains 22 as substring.

Together with 1123012220219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123012220201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561506110110 + 561506110111.

It is an arithmetic number, because the mean of its divisors is an integer number (561506110111).

Almost surely, 2^{1123012220221} is an apocalyptic number.

It is an amenable number.

1123012220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123012220221 is an equidigital number, since it uses as much as digits as its factorization.

1123012220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1123012220221 its reverse (1220222103211), we get a palindrome (2343234323432).

The spelling of 1123012220221 in words is "one trillion, one hundred twenty-three billion, twelve million, two hundred twenty thousand, two hundred twenty-one".