1000120212221 has 8 divisors (see below), whose sum is σ = 1079388882264. Its totient is φ = 921185305920.

The previous prime is 1000120212191. The next prime is 1000120212229. The reversal of 1000120212221 is 1222120210001.

It can be written as a sum of positive squares in 4 ways, for example, as 66635743321 + 933484468900 = 258139^2 + 966170^2 .

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 1000120212221 - 2¹⁰ = 1000120211197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000120212196 and 1000120212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000120212229) 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, 83434706 + ... + 83446691.

It is an arithmetic number, because the mean of its divisors is an integer number (134923610283).

Almost surely, 2^{1000120212221} is an apocalyptic number.

It is an amenable number.

1000120212221 is a deficient number, since it is larger than the sum of its proper divisors (79268670043).

1000120212221 is a wasteful number, since it uses less digits than its factorization.

1000120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166881871.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1000120212221 its reverse (1222120210001), we get a palindrome (2222240422222).

The spelling of 1000120212221 in words is "one trillion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".