2102121110321 has 4 divisors (see below), whose sum is σ = 2114272099572. Its totient is φ = 2089970121072.

The previous prime is 2102121110291. The next prime is 2102121110359. The reversal of 2102121110321 is 1230111212012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1904331000625 + 197790109696 = 1379975^2 + 444736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102121110321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102121110321.

It is not an unprimeable number, because it can be changed into a prime (2102121112321) 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, 6075494366 + ... + 6075494711.

It is an arithmetic number, because the mean of its divisors is an integer number (528568024893).

Almost surely, 2^{2102121110321} is an apocalyptic number.

It is an amenable number.

2102121110321 is a deficient number, since it is larger than the sum of its proper divisors (12150989251).

2102121110321 is a wasteful number, since it uses less digits than its factorization.

2102121110321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12150989250.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2102121110321 its reverse (1230111212012), we get a palindrome (3332232322333).

The spelling of 2102121110321 in words is "two trillion, one hundred two billion, one hundred twenty-one million, one hundred ten thousand, three hundred twenty-one".