21102333121 has 8 divisors (see below), whose sum is σ = 22377461544. Its totient is φ = 19830961920.

The previous prime is 21102333097. The next prime is 21102333167. The reversal of 21102333121 is 12133320112.

It can be written as a sum of positive squares in 4 ways, for example, as 14680714896 + 6421618225 = 121164^2 + 80135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102333121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102333191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 927730 + ... + 950203.

It is an arithmetic number, because the mean of its divisors is an integer number (2797182693).

Almost surely, 2^21102333121 is an apocalyptic number.

It is an amenable number.

21102333121 is a deficient number, since it is larger than the sum of its proper divisors (1275128423).

21102333121 is a wasteful number, since it uses less digits than its factorization.

21102333121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878611.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21102333121 its reverse (12133320112), we get a palindrome (33235653233).

The spelling of 21102333121 in words is "twenty-one billion, one hundred two million, three hundred thirty-three thousand, one hundred twenty-one".