1121400243 has 12 divisors (see below), whose sum is σ = 1635527920. Its totient is φ = 740341296.

The previous prime is 1121400193. The next prime is 1121400251. The reversal of 1121400243 is 3420041211.

1121400243 is a `hidden beast` number, since 1 + 1 + 21 + 400 + 243 = 666.

It is not a de Polignac number, because 1121400243 - 2⁶ = 1121400179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121400283) 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 11 ways as a sum of consecutive naturals, for example, 603928 + ... + 605781.

Almost surely, 2^1121400243 is an apocalyptic number.

1121400243 is a deficient number, since it is larger than the sum of its proper divisors (514127677).

1121400243 is a wasteful number, since it uses less digits than its factorization.

1121400243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209818 (or 1209815 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1121400243 is about 33487.3146579417. The cubic root of 1121400243 is about 1038.9314230854.

Adding to 1121400243 its reverse (3420041211), we get a palindrome (4541441454).

The spelling of 1121400243 in words is "one billion, one hundred twenty-one million, four hundred thousand, two hundred forty-three".