1001001321 has 12 divisors (see below), whose sum is σ = 1499442672. Its totient is φ = 667334052.

The previous prime is 1001001317. The next prime is 1001001329. The reversal of 1001001321 is 1231001001.

1001001321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001001321 - 2² = 1001001317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1001001329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2059431 + ... + 2059916.

It is an arithmetic number, because the mean of its divisors is an integer number (124953556).

Almost surely, 2^1001001321 is an apocalyptic number.

It is an amenable number.

1001001321 is a deficient number, since it is larger than the sum of its proper divisors (498441351).

1001001321 is an frugal number, since it uses more digits than its factorization.

1001001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119362 (or 4119350 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1001001321 is about 31638.6049155142. The cubic root of 1001001321 is about 1000.3336623237. Note that the first 3 decimals are identical.

Adding to 1001001321 its reverse (1231001001), we get a palindrome (2232002322).

The spelling of 1001001321 in words is "one billion, one million, one thousand, three hundred twenty-one".