1002121211221 has 24 divisors (see below), whose sum is σ = 1111233008160. Its totient is φ = 902822671296.

The previous prime is 1002121211213. The next prime is 1002121211227. The reversal of 1002121211221 is 1221121212001.

It is not a de Polignac number, because 1002121211221 - 2³ = 1002121211213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002121211195 and 1002121211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002121211227) 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 23 ways as a sum of consecutive naturals, for example, 9445215 + ... + 9550723.

It is an arithmetic number, because the mean of its divisors is an integer number (46301375340).

Almost surely, 2^{1002121211221} is an apocalyptic number.

It is an amenable number.

1002121211221 is a deficient number, since it is larger than the sum of its proper divisors (109111796939).

1002121211221 is a wasteful number, since it uses less digits than its factorization.

1002121211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106885 (or 106872 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1002121211221 its reverse (1221121212001), we get a palindrome (2223242423222).

The spelling of 1002121211221 in words is "one trillion, two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".