1001222011221 has 4 divisors (see below), whose sum is σ = 1334962681632. Its totient is φ = 667481340812.

The previous prime is 1001222011189. The next prime is 1001222011243. The reversal of 1001222011221 is 1221102221001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001222011221 - 2⁵ = 1001222011189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001222011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222011271) 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, 166870335201 + ... + 166870335206.

It is an arithmetic number, because the mean of its divisors is an integer number (333740670408).

Almost surely, 2^{1001222011221} is an apocalyptic number.

It is an amenable number.

1001222011221 is a deficient number, since it is larger than the sum of its proper divisors (333740670411).

1001222011221 is an equidigital number, since it uses as much as digits as its factorization.

1001222011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333740670410.

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

Adding to 1001222011221 its reverse (1221102221001), we get a palindrome (2222324232222).

The spelling of 1001222011221 in words is "one trillion, one billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".