1123321423981 has 2 divisors, whose sum is σ = 1123321423982. Its totient is φ = 1123321423980.

The previous prime is 1123321423979. The next prime is 1123321424003. The reversal of 1123321423981 is 1893241233211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884258122500 + 239063301481 = 940350^2 + 488941^2 .

It is an emirp because it is prime and its reverse (1893241233211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123321423981 - 2¹ = 1123321423979 is a prime.

It is a super-2 number, since 2×1123321423981² (a number of 25 digits) contains 22 as substring.

Together with 1123321423979, 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 (1123321423901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561660711990 + 561660711991.

It is an arithmetic number, because the mean of its divisors is an integer number (561660711991).

Almost surely, 2^{1123321423981} is an apocalyptic number.

It is an amenable number.

1123321423981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123321423981 is an equidigital number, since it uses as much as digits as its factorization.

1123321423981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The spelling of 1123321423981 in words is "one trillion, one hundred twenty-three billion, three hundred twenty-one million, four hundred twenty-three thousand, nine hundred eighty-one".