1121021221266 has 24 divisors (see below), whose sum is σ = 2428971266124. Its totient is φ = 373659593760.

The previous prime is 1121021221181. The next prime is 1121021221267. The reversal of 1121021221266 is 6621221201211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 824073606225 + 296947615041 = 907785^2 + 544929^2 .

It is not an unprimeable number, because it can be changed into a prime (1121021221267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 684625 + ... + 1646436.

Almost surely, 2^{1121021221266} is an apocalyptic number.

1121021221266 is an abundant number, since it is smaller than the sum of its proper divisors (1307950044858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121021221266 is a wasteful number, since it uses less digits than its factorization.

1121021221266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357786 (or 2357783 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 1121021221266 its reverse (6621221201211), we get a palindrome (7742242422477).

The spelling of 1121021221266 in words is "one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred sixty-six".