1123121000 has 64 divisors (see below), whose sum is σ = 2667487680. Its totient is φ = 442516800.

The previous prime is 1123120969. The next prime is 1123121003. The reversal of 1123121000 is 1213211.

It is a super-2 number, since 2×1123121000² = 2522801561282000000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123121003) 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, 58619 + ... + 75381.

It is an arithmetic number, because the mean of its divisors is an integer number (41679495).

Almost surely, 2^1123121000 is an apocalyptic number.

1123121000 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 1123121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333743840).

1123121000 is an abundant number, since it is smaller than the sum of its proper divisors (1544366680).

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

1123121000 is a wasteful number, since it uses less digits than its factorization.

1123121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16851 (or 16837 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1123121000 is about 33512.9974785903. The cubic root of 1123121000 is about 1039.4625551506.

Adding to 1123121000 its reverse (1213211), we get a palindrome (1124334211).

The spelling of 1123121000 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand".