1100221121 has 4 divisors (see below), whose sum is σ = 1105155072. Its totient is φ = 1095287172.

The previous prime is 1100221097. The next prime is 1100221127. The reversal of 1100221121 is 1211220011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1100221121 - 2²⁶ = 1033112257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100221127) 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, 2466641 + ... + 2467086.

It is an arithmetic number, because the mean of its divisors is an integer number (276288768).

Almost surely, 2^1100221121 is an apocalyptic number.

It is an amenable number.

1100221121 is a deficient number, since it is larger than the sum of its proper divisors (4933951).

1100221121 is an equidigital number, since it uses as much as digits as its factorization.

1100221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933950.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1100221121 is about 33169.5812605465. The cubic root of 1100221121 is about 1032.3492801589.

Adding to 1100221121 its reverse (1211220011), we get a palindrome (2311441132).

It can be divided in two parts, 11002 and 21121, that added together give a palindrome (32123).

The spelling of 1100221121 in words is "one billion, one hundred million, two hundred twenty-one thousand, one hundred twenty-one".