1000221221121 has 8 divisors (see below), whose sum is σ = 1335997086240. Its totient is φ = 665629751712.

The previous prime is 1000221221101. The next prime is 1000221221171. The reversal of 1000221221121 is 1211221220001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1000221221121 - 2¹⁷ = 1000221090049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000221221121.

It is not an unprimeable number, because it can be changed into a prime (1000221221101) 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, 296096956 + ... + 296100333.

It is an arithmetic number, because the mean of its divisors is an integer number (166999635780).

Almost surely, 2^{1000221221121} is an apocalyptic number.

It is an amenable number.

1000221221121 is a deficient number, since it is larger than the sum of its proper divisors (335775865119).

1000221221121 is an equidigital number, since it uses as much as digits as its factorization.

1000221221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592197855.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1000221221121 its reverse (1211221220001), we get a palindrome (2211442441122).

The spelling of 1000221221121 in words is "one trillion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".