1001123321 has 4 divisors (see below), whose sum is σ = 1092134544. Its totient is φ = 910112100.

The previous prime is 1001123309. The next prime is 1001123339. The reversal of 1001123321 is 1233211001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1233211001 = 11 ⋅112110091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001123321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001123296 and 1001123305.

It is not an unprimeable number, because it can be changed into a prime (1001123621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45505595 + ... + 45505616.

It is an arithmetic number, because the mean of its divisors is an integer number (273033636).

Almost surely, 2^1001123321 is an apocalyptic number.

1001123321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001123321 is a deficient number, since it is larger than the sum of its proper divisors (91011223).

1001123321 is an equidigital number, since it uses as much as digits as its factorization.

1001123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91011222.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1001123321 is about 31640.5328811005. The cubic root of 1001123321 is about 1000.3743002152.

Adding to 1001123321 its reverse (1233211001), we get a palindrome (2234334322).

It can be divided in two parts, 1001 and 123321, that multiplied together give a palindrome (123444321).

The spelling of 1001123321 in words is "one billion, one million, one hundred twenty-three thousand, three hundred twenty-one".