1100321021 has 2 divisors, whose sum is σ = 1100321022. Its totient is φ = 1100321020.

The previous prime is 1100321011. The next prime is 1100321029. The reversal of 1100321021 is 1201230011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550418521 + 549902500 = 23461^2 + 23450^2 .

It is an emirp because it is prime and its reverse (1201230011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100321021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100320993 and 1100321011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100321029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550160510 + 550160511.

It is an arithmetic number, because the mean of its divisors is an integer number (550160511).

Almost surely, 2^1100321021 is an apocalyptic number.

It is an amenable number.

1100321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100321021 is an equidigital number, since it uses as much as digits as its factorization.

1100321021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1100321021 is about 33171.0871241809. The cubic root of 1100321021 is about 1032.3805249605.

Adding to 1100321021 its reverse (1201230011), we get a palindrome (2301551032).

The spelling of 1100321021 in words is "one billion, one hundred million, three hundred twenty-one thousand, twenty-one".