1123211110381 has 2 divisors, whose sum is σ = 1123211110382. Its totient is φ = 1123211110380.

The previous prime is 1123211110339. The next prime is 1123211110421. The reversal of 1123211110381 is 1830111123211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 750763329156 + 372447781225 = 866466^2 + 610285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123211110381 - 2¹¹ = 1123211108333 is a prime.

It is a super-2 number, since 2×1123211110381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123211110331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561605555190 + 561605555191.

It is an arithmetic number, because the mean of its divisors is an integer number (561605555191).

Almost surely, 2^{1123211110381} is an apocalyptic number.

It is an amenable number.

1123211110381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123211110381 is an equidigital number, since it uses as much as digits as its factorization.

1123211110381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 1123211110381 its reverse (1830111123211), we get a palindrome (2953322233592).

The spelling of 1123211110381 in words is "one trillion, one hundred twenty-three billion, two hundred eleven million, one hundred ten thousand, three hundred eighty-one".