1001100221221 has 4 divisors (see below), whose sum is σ = 1013772376000. Its totient is φ = 988428066444.

The previous prime is 1001100221171. The next prime is 1001100221227. The reversal of 1001100221221 is 1221220011001.

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 a de Polignac number, because none of the positive numbers 2^k-1001100221221 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 (1001100221227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6336077271 + ... + 6336077428.

It is an arithmetic number, because the mean of its divisors is an integer number (253443094000).

Almost surely, 2^{1001100221221} is an apocalyptic number.

It is an amenable number.

1001100221221 is a deficient number, since it is larger than the sum of its proper divisors (12672154779).

1001100221221 is an equidigital number, since it uses as much as digits as its factorization.

1001100221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12672154778.

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

Adding to 1001100221221 its reverse (1221220011001), we get a palindrome (2222320232222).

The spelling of 1001100221221 in words is "one trillion, one billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-one".