1123213021100 has 72 divisors (see below), whose sum is σ = 2517855263616. Its totient is φ = 434471040000.

The previous prime is 1123213021039. The next prime is 1123213021109. The reversal of 1123213021100 is 11203123211.

It is not an unprimeable number, because it can be changed into a prime (1123213021109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4085990 + ... + 4352210.

Almost surely, 2^{1123213021100} is an apocalyptic number.

1123213021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123213021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258927631808).

1123213021100 is an abundant number, since it is smaller than the sum of its proper divisors (1394642242516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1123213021100 is a wasteful number, since it uses less digits than its factorization.

1123213021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267627 (or 267620 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1123213021100 its reverse (11203123211), we get a palindrome (1134416144311).

The spelling of 1123213021100 in words is "one trillion, one hundred twenty-three billion, two hundred thirteen million, twenty-one thousand, one hundred".