1122221100221 has 8 divisors (see below), whose sum is σ = 1221005036664. Its totient is φ = 1025217054720.

The previous prime is 1122221100179. The next prime is 1122221100223. The reversal of 1122221100221 is 1220011222211.

It can be written as a sum of positive squares in 4 ways, for example, as 299597496025 + 822623604196 = 547355^2 + 906986^2 .

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 1122221100221 - 2²² = 1122216905917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1122221100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122221100223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444971420 + ... + 444973941.

It is an arithmetic number, because the mean of its divisors is an integer number (152625629583).

Almost surely, 2^{1122221100221} is an apocalyptic number.

It is an amenable number.

1122221100221 is a deficient number, since it is larger than the sum of its proper divisors (98783936443).

1122221100221 is an equidigital number, since it uses as much as digits as its factorization.

1122221100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889945471.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1122221100221 its reverse (1220011222211), we get a palindrome (2342232322432).

The spelling of 1122221100221 in words is "one trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".