1001100000221 has 4 divisors (see below), whose sum is σ = 1001102002332. Its totient is φ = 1001097998112.

The previous prime is 1001100000211. The next prime is 1001100000239. The reversal of 1001100000221 is 1220000011001.

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 875207025625 + 125892974596 = 935525^2 + 354814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001100000221 - 2¹⁰ = 1001099999197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1001100000199 and 1001100000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001100000211) 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, 452831 + ... + 1485683.

It is an arithmetic number, because the mean of its divisors is an integer number (250275500583).

Almost surely, 2^{1001100000221} is an apocalyptic number.

It is an amenable number.

1001100000221 is a deficient number, since it is larger than the sum of its proper divisors (2002111).

1001100000221 is an equidigital number, since it uses as much as digits as its factorization.

1001100000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002110.

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

Adding to 1001100000221 its reverse (1220000011001), we get a palindrome (2221100011222).

The spelling of 1001100000221 in words is "one trillion, one billion, one hundred million, two hundred twenty-one", and thus it is an aban number.