1123311021 has 32 divisors (see below), whose sum is σ = 1727232000. Its totient is φ = 636102720.

The previous prime is 1123311019. The next prime is 1123311067. The reversal of 1123311021 is 1201133211.

It is a happy number.

It is not a de Polignac number, because 1123311021 - 2¹ = 1123311019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123311221) 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 31 ways as a sum of consecutive naturals, for example, 1625286 + ... + 1625976.

It is an arithmetic number, because the mean of its divisors is an integer number (53976000).

Almost surely, 2^1123311021 is an apocalyptic number.

It is an amenable number.

1123311021 is a deficient number, since it is larger than the sum of its proper divisors (603920979).

1123311021 is a wasteful number, since it uses less digits than its factorization.

1123311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1123311021 is about 33515.8323930646. The cubic root of 1123311021 is about 1039.5211741168.

Adding to 1123311021 its reverse (1201133211), we get a palindrome (2324444232).

It can be divided in two parts, 112 and 3311021, that added together give a palindrome (3311133).

The spelling of 1123311021 in words is "one billion, one hundred twenty-three million, three hundred eleven thousand, twenty-one".