1100001321 has 6 divisors (see below), whose sum is σ = 1588890810. Its totient is φ = 733334208.

The previous prime is 1100001317. The next prime is 1100001323. The reversal of 1100001321 is 1231000011.

It can be written as a sum of positive squares in only one way, i.e., 1071645696 + 28355625 = 32736^2 + 5325^2 .

It is not a de Polignac number, because 1100001321 - 2² = 1100001317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 122222369 = 1100001321 / (1 + 1 + 0 + 0 + 0 + 0 + 1 + 3 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1100001323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61111176 + ... + 61111193.

It is an arithmetic number, because the mean of its divisors is an integer number (264815135).

Almost surely, 2^1100001321 is an apocalyptic number.

It is an amenable number.

1100001321 is a deficient number, since it is larger than the sum of its proper divisors (488889489).

1100001321 is a wasteful number, since it uses less digits than its factorization.

1100001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122222375 (or 122222372 counting only the distinct ones).

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

The square root of 1100001321 is about 33166.2678183723. The cubic root of 1100001321 is about 1032.2805286811.

Adding to 1100001321 its reverse (1231000011), we get a palindrome (2331001332).

The spelling of 1100001321 in words is "one billion, one hundred million, one thousand, three hundred twenty-one".