1123211110981 has 2 divisors, whose sum is σ = 1123211110982. Its totient is φ = 1123211110980.

The previous prime is 1123211110979. The next prime is 1123211111051. The reversal of 1123211110981 is 1890111123211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084899312225 + 38311798756 = 1041585^2 + 195734^2 .

It is an emirp because it is prime and its reverse (1890111123211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123211110981 - 2¹ = 1123211110979 is a prime.

It is a super-2 number, since 2×1123211110981² (a number of 25 digits) contains 22 as substring.

Together with 1123211110979, 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 (1123211110381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561605555490 + 561605555491.

It is an arithmetic number, because the mean of its divisors is an integer number (561605555491).

Almost surely, 2^{1123211110981} is an apocalyptic number.

It is an amenable number.

1123211110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123211110981 is an equidigital number, since it uses as much as digits as its factorization.

1123211110981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 31.

The spelling of 1123211110981 in words is "one trillion, one hundred twenty-three billion, two hundred eleven million, one hundred ten thousand, nine hundred eighty-one".