1121121231 has 16 divisors (see below), whose sum is σ = 1544045568. Its totient is φ = 722836800.

The previous prime is 1121121103. The next prime is 1121121263. The reversal of 1121121231 is 1321211211.

It is not a de Polignac number, because 1121121231 - 2⁷ = 1121121103 is a prime.

It is a super-2 number, since 2×1121121231² = 2513825629197910722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1121121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195355 + ... + 201011.

It is an arithmetic number, because the mean of its divisors is an integer number (96502848).

Almost surely, 2^1121121231 is an apocalyptic number.

1121121231 is a deficient number, since it is larger than the sum of its proper divisors (422924337).

1121121231 is a wasteful number, since it uses less digits than its factorization.

1121121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822.

The product of its digits is 24, while the sum is 15.

The square root of 1121121231 is about 33483.1484630702. The cubic root of 1121121231 is about 1038.8452515392.

Adding to 1121121231 its reverse (1321211211), we get a palindrome (2442332442).

The spelling of 1121121231 in words is "one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-one".