21031210323 has 12 divisors (see below), whose sum is σ = 32165380728. Its totient is φ = 13196053440.

The previous prime is 21031210243. The next prime is 21031210331. The reversal of 21031210323 is 32301213012.

21031210323 is a `hidden beast` number, since 21 + 0 + 312 + 10 + 323 = 666.

It is not a de Polignac number, because 21031210323 - 2²² = 21027016019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031210296 and 21031210305.

It is not an unprimeable number, because it can be changed into a prime (21031210393) 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, 68729293 + ... + 68729598.

It is an arithmetic number, because the mean of its divisors is an integer number (2680448394).

Almost surely, 2^21031210323 is an apocalyptic number.

21031210323 is a deficient number, since it is larger than the sum of its proper divisors (11134170405).

21031210323 is a wasteful number, since it uses less digits than its factorization.

21031210323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137458914 (or 137458911 counting only the distinct ones).

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

Adding to 21031210323 its reverse (32301213012), we get a palindrome (53332423335).

The spelling of 21031210323 in words is "twenty-one billion, thirty-one million, two hundred ten thousand, three hundred twenty-three".