21230332123 has 24 divisors (see below), whose sum is σ = 28661700096. Its totient is φ = 15270559200.

The previous prime is 21230332117. The next prime is 21230332127. The reversal of 21230332123 is 32123303212.

It is a de Polignac number, because none of the positive numbers 2^k-21230332123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230332094 and 21230332103.

It is not an unprimeable number, because it can be changed into a prime (21230332127) 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 23 ways as a sum of consecutive naturals, for example, 802723 + ... + 828748.

It is an arithmetic number, because the mean of its divisors is an integer number (1194237504).

Almost surely, 2^21230332123 is an apocalyptic number.

21230332123 is a deficient number, since it is larger than the sum of its proper divisors (7431367973).

21230332123 is a wasteful number, since it uses less digits than its factorization.

21230332123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631515 (or 1631502 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21230332123 its reverse (32123303212), we get a palindrome (53353635335).

It can be divided in two parts, 21230 and 332123, that added together give a palindrome (353353).

The spelling of 21230332123 in words is "twenty-one billion, two hundred thirty million, three hundred thirty-two thousand, one hundred twenty-three".