1002011211221 has 4 divisors (see below), whose sum is σ = 1004051967744. Its totient is φ = 999970454700.

The previous prime is 1002011211203. The next prime is 1002011211247. The reversal of 1002011211221 is 1221121102001.

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 1002011211221 - 2³⁰ = 1000937469397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002011211196 and 1002011211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002011211121) 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, 1020377525 + ... + 1020378506.

It is an arithmetic number, because the mean of its divisors is an integer number (251012991936).

Almost surely, 2^{1002011211221} is an apocalyptic number.

It is an amenable number.

1002011211221 is a deficient number, since it is larger than the sum of its proper divisors (2040756523).

1002011211221 is an equidigital number, since it uses as much as digits as its factorization.

1002011211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040756522.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1002011211221 its reverse (1221121102001), we get a palindrome (2223132313222).

The spelling of 1002011211221 in words is "one trillion, two billion, eleven million, two hundred eleven thousand, two hundred twenty-one".