1001222010221 has 4 divisors (see below), whose sum is σ = 1001567619612. Its totient is φ = 1000876400832.

The previous prime is 1001222010199. The next prime is 1001222010253. The reversal of 1001222010221 is 1220102221001.

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 102280994596 + 898941015625 = 319814^2 + 948125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001222010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001222010196 and 1001222010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222010281) 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, 172800350 + ... + 172806143.

It is an arithmetic number, because the mean of its divisors is an integer number (250391904903).

Almost surely, 2^{1001222010221} is an apocalyptic number.

It is an amenable number.

1001222010221 is a deficient number, since it is larger than the sum of its proper divisors (345609391).

1001222010221 is an equidigital number, since it uses as much as digits as its factorization.

1001222010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345609390.

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

Adding to 1001222010221 its reverse (1220102221001), we get a palindrome (2221324231222).

The spelling of 1001222010221 in words is "one trillion, one billion, two hundred twenty-two million, ten thousand, two hundred twenty-one".