21123123332 has 24 divisors (see below), whose sum is σ = 38229864960. Its totient is φ = 10205994240.

The previous prime is 21123123313. The next prime is 21123123353. The reversal of 21123123332 is 23332132112.

It is a junction number, because it is equal to n+sod(n) for n = 21123123298 and 21123123307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696269 + ... + 725972.

It is an arithmetic number, because the mean of its divisors is an integer number (1592911040).

Almost surely, 2^21123123332 is an apocalyptic number.

It is an amenable number.

21123123332 is a deficient number, since it is larger than the sum of its proper divisors (17106741628).

21123123332 is a wasteful number, since it uses less digits than its factorization.

21123123332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422371 (or 1422369 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 21123123332 its reverse (23332132112), we get a palindrome (44455255444).

The spelling of 21123123332 in words is "twenty-one billion, one hundred twenty-three million, one hundred twenty-three thousand, three hundred thirty-two".