1001021101221 has 4 divisors (see below), whose sum is σ = 1334694801632. Its totient is φ = 667347400812.

The previous prime is 1001021101139. The next prime is 1001021101253. The reversal of 1001021101221 is 1221011201001.

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 not a de Polignac number, because 1001021101221 - 2¹⁷ = 1001020970149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001021101197 and 1001021101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001021101291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166836850201 + ... + 166836850206.

It is an arithmetic number, because the mean of its divisors is an integer number (333673700408).

Almost surely, 2^{1001021101221} is an apocalyptic number.

It is an amenable number.

1001021101221 is a deficient number, since it is larger than the sum of its proper divisors (333673700411).

1001021101221 is an equidigital number, since it uses as much as digits as its factorization.

1001021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333673700410.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001021101221 its reverse (1221011201001), we get a palindrome (2222032302222).

The spelling of 1001021101221 in words is "one trillion, one billion, twenty-one million, one hundred one thousand, two hundred twenty-one".