1121343211981 has 4 divisors (see below), whose sum is σ = 1128869005500. Its totient is φ = 1113817418464.

The previous prime is 1121343211931. The next prime is 1121343212051. The reversal of 1121343211981 is 1891123431211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47114609481 + 1074228602500 = 217059^2 + 1036450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121343211981 - 2¹¹ = 1121343209933 is a prime.

It is a super-2 number, since 2×1121343211981² (a number of 25 digits) contains 22 as substring.

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 1121343211981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121343211921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3762896536 + ... + 3762896833.

It is an arithmetic number, because the mean of its divisors is an integer number (282217251375).

Almost surely, 2^{1121343211981} is an apocalyptic number.

It is an amenable number.

1121343211981 is a deficient number, since it is larger than the sum of its proper divisors (7525793519).

1121343211981 is an equidigital number, since it uses as much as digits as its factorization.

1121343211981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7525793518.

The product of its digits is 10368, while the sum is 37.

The spelling of 1121343211981 in words is "one trillion, one hundred twenty-one billion, three hundred forty-three million, two hundred eleven thousand, nine hundred eighty-one".