1100221021 has 4 divisors (see below), whose sum is σ = 1100447932. Its totient is φ = 1099994112.

The previous prime is 1100221013. The next prime is 1100221063. The reversal of 1100221021 is 1201220011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 399560121 + 700660900 = 19989^2 + 26470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100221021 - 2³ = 1100221013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100220989 and 1100221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100231021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106020 + ... + 115933.

It is an arithmetic number, because the mean of its divisors is an integer number (275111983).

Almost surely, 2^1100221021 is an apocalyptic number.

It is an amenable number.

1100221021 is a deficient number, since it is larger than the sum of its proper divisors (226911).

1100221021 is an equidigital number, since it uses as much as digits as its factorization.

1100221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226910.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1100221021 is about 33169.5797531413. The cubic root of 1100221021 is about 1032.3492488819.

Adding to 1100221021 its reverse (1201220011), we get a palindrome (2301441032).

It can be divided in two parts, 11002 and 21021, that added together give a palindrome (32023).

The spelling of 1100221021 in words is "one billion, one hundred million, two hundred twenty-one thousand, twenty-one".