1001321321 has 24 divisors (see below), whose sum is σ = 1368448704. Its totient is φ = 720226080.

The previous prime is 1001321291. The next prime is 1001321329. The reversal of 1001321321 is 1231231001.

It is not a de Polignac number, because 1001321321 - 2⁶ = 1001321257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001321296 and 1001321305.

It is not an unprimeable number, because it can be changed into a prime (1001321329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64445 + ... + 78458.

It is an arithmetic number, because the mean of its divisors is an integer number (57018696).

Almost surely, 2^1001321321 is an apocalyptic number.

1001321321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001321321 is a deficient number, since it is larger than the sum of its proper divisors (367127383).

1001321321 is a wasteful number, since it uses less digits than its factorization.

1001321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142941 (or 142934 counting only the distinct ones).

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

The square root of 1001321321 is about 31643.6616244075. The cubic root of 1001321321 is about 1000.4402464879.

Adding to 1001321321 its reverse (1231231001), we get a palindrome (2232552322).

The spelling of 1001321321 in words is "one billion, one million, three hundred twenty-one thousand, three hundred twenty-one".