1100021001221 has 8 divisors (see below), whose sum is σ = 1111893635160. Its totient is φ = 1088159228928.

The previous prime is 1100021001217. The next prime is 1100021001229. The reversal of 1100021001221 is 1221001200011.

It can be written as a sum of positive squares in 4 ways, for example, as 77871693025 + 1022149308196 = 279055^2 + 1011014^2 .

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 1100021001221 - 2² = 1100021001217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100021001229) 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, 2511686 + ... + 2916951.

It is an arithmetic number, because the mean of its divisors is an integer number (138986704395).

Almost surely, 2^{1100021001221} is an apocalyptic number.

It is an amenable number.

1100021001221 is a deficient number, since it is larger than the sum of its proper divisors (11872633939).

1100021001221 is an equidigital number, since it uses as much as digits as its factorization.

1100021001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430823.

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

Adding to 1100021001221 its reverse (1221001200011), we get a palindrome (2321022201232).

The spelling of 1100021001221 in words is "one trillion, one hundred billion, twenty-one million, one thousand, two hundred twenty-one".