1000011011221 has 4 divisors (see below), whose sum is σ = 1009912110444. Its totient is φ = 990109912000.

The previous prime is 1000011011213. The next prime is 1000011011243. The reversal of 1000011011221 is 1221101100001.

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 526647747025 + 473363264196 = 725705^2 + 688014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000011011221 - 2³ = 1000011011213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000011011198 and 1000011011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000011011281) 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 3 ways as a sum of consecutive naturals, for example, 4950549460 + ... + 4950549661.

It is an arithmetic number, because the mean of its divisors is an integer number (252478027611).

Almost surely, 2^{1000011011221} is an apocalyptic number.

It is an amenable number.

1000011011221 is a deficient number, since it is larger than the sum of its proper divisors (9901099223).

1000011011221 is an equidigital number, since it uses as much as digits as its factorization.

1000011011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9901099222.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1000011011221 its reverse (1221101100001), we get a palindrome (2221112111222).

The spelling of 1000011011221 in words is "one trillion, eleven million, eleven thousand, two hundred twenty-one".