1121223112021 has 16 divisors (see below), whose sum is σ = 1160596998000. Its totient is φ = 1082659488768.

The previous prime is 1121223111989. The next prime is 1121223112033. The reversal of 1121223112021 is 1202113221211.

It can be written as a sum of positive squares in 8 ways, for example, as 35677920996 + 1085545191025 = 188886^2 + 1041895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121223112021 - 2⁵ = 1121223111989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121223112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121223112081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209485 + ... + 1512061.

It is an arithmetic number, because the mean of its divisors is an integer number (72537312375).

Almost surely, 2^{1121223112021} is an apocalyptic number.

It is an amenable number.

1121223112021 is a deficient number, since it is larger than the sum of its proper divisors (39373885979).

1121223112021 is a wasteful number, since it uses less digits than its factorization.

1121223112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302888.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1121223112021 its reverse (1202113221211), we get a palindrome (2323336333232).

The spelling of 1121223112021 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-three million, one hundred twelve thousand, twenty-one".