1100001221 has 8 divisors (see below), whose sum is σ = 1202576544. Its totient is φ = 997855120.

The previous prime is 1100001211. The next prime is 1100001239. The reversal of 1100001221 is 1221000011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1100001221 - 2¹⁰ = 1100000197 is a prime.

It is a Duffinian number.

1100001221 is a modest number, since divided by 1221 gives 1100 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1100001199 and 1100001208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100001211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101930 + ... + 112203.

It is an arithmetic number, because the mean of its divisors is an integer number (150322068).

Almost surely, 2^1100001221 is an apocalyptic number.

1100001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100001221 is a deficient number, since it is larger than the sum of its proper divisors (102575323).

1100001221 is a wasteful number, since it uses less digits than its factorization.

1100001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214611.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1100001221 is about 33166.2663108165. The cubic root of 1100001221 is about 1032.2804973999.

Adding to 1100001221 its reverse (1221000011), we get a palindrome (2321001232).

The spelling of 1100001221 in words is "one billion, one hundred million, one thousand, two hundred twenty-one".