1100921 has 2 divisors, whose sum is σ = 1100922. Its totient is φ = 1100920.

The previous prime is 1100909. The next prime is 1100933. The reversal of 1100921 is 1290011.

It is a balanced prime because it is at equal distance from previous prime (1100909) and next prime (1100933).

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 19321 = 1040^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100921 - 2⁶ = 1100857 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100896 and 1100905.

It is not a weakly prime, because it can be changed into another prime (1100321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550460 + 550461.

It is an arithmetic number, because the mean of its divisors is an integer number (550461).

2^1100921 is an apocalyptic number.

It is an amenable number.

1100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100921 is an equidigital number, since it uses as much as digits as its factorization.

1100921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1100921 is about 1049.2478258257. The cubic root of 1100921 is about 103.2568135084.

Adding to 1100921 its reverse (1290011), we get a palindrome (2390932).

The spelling of 1100921 in words is "one million, one hundred thousand, nine hundred twenty-one".