1002121012221 has 12 divisors (see below), whose sum is σ = 1554310141632. Its totient is φ = 572640578328.

The previous prime is 1002121012201. The next prime is 1002121012261. The reversal of 1002121012221 is 1222101212001.

It is not a de Polignac number, because 1002121012221 - 2⁶ = 1002121012157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002121012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002121012201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3408574725 + ... + 3408575018.

It is an arithmetic number, because the mean of its divisors is an integer number (129525845136).

Almost surely, 2^{1002121012221} is an apocalyptic number.

It is an amenable number.

1002121012221 is a deficient number, since it is larger than the sum of its proper divisors (552189129411).

1002121012221 is an equidigital number, since it uses as much as digits as its factorization.

1002121012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817149760 (or 6817149753 counting only the distinct ones).

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

Adding to 1002121012221 its reverse (1222101212001), we get a palindrome (2224222224222).

The spelling of 1002121012221 in words is "one trillion, two billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".