21303102123 has 12 divisors (see below), whose sum is σ = 31141885320. Its totient is φ = 14030958336.

The previous prime is 21303102089. The next prime is 21303102181. The reversal of 21303102123 is 32120130312.

It is not a de Polignac number, because 21303102123 - 2¹² = 21303098027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303102096 and 21303102105.

It is not an unprimeable number, because it can be changed into a prime (21303100123) 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 11 ways as a sum of consecutive naturals, for example, 14258358 + ... + 14259851.

It is an arithmetic number, because the mean of its divisors is an integer number (2595157110).

Almost surely, 2^21303102123 is an apocalyptic number.

21303102123 is a deficient number, since it is larger than the sum of its proper divisors (9838783197).

21303102123 is a wasteful number, since it uses less digits than its factorization.

21303102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28518298 (or 28518295 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21303102123 its reverse (32120130312), we get a palindrome (53423232435).

The spelling of 21303102123 in words is "twenty-one billion, three hundred three million, one hundred two thousand, one hundred twenty-three".