1000221011221 has 8 divisors (see below), whose sum is σ = 1001444102784. Its totient is φ = 998998136400.

The previous prime is 1000221011161. The next prime is 1000221011233. The reversal of 1000221011221 is 1221101220001.

1000221011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1000221011221 - 2⁹ = 1000221010709 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 (1000221012221) 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, 10403671 + ... + 10499371.

It is an arithmetic number, because the mean of its divisors is an integer number (125180512848).

Almost surely, 2^{1000221011221} is an apocalyptic number.

It is an amenable number.

1000221011221 is a deficient number, since it is larger than the sum of its proper divisors (1223091563).

1000221011221 is an equidigital number, since it uses as much as digits as its factorization.

1000221011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108371.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1000221011221 its reverse (1221101220001), we get a palindrome (2221322231222).

The spelling of 1000221011221 in words is "one trillion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".