21331232123 has 8 divisors (see below), whose sum is σ = 21702759936. Its totient is φ = 20962866600.

The previous prime is 21331232077. The next prime is 21331232129. The reversal of 21331232123 is 32123213312.

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

It is a cyclic number.

It is not a de Polignac number, because 21331232123 - 2⁶ = 21331232059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331232129) 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, 776963 + ... + 803948.

It is an arithmetic number, because the mean of its divisors is an integer number (2712844992).

Almost surely, 2^21331232123 is an apocalyptic number.

21331232123 is a deficient number, since it is larger than the sum of its proper divisors (371527813).

21331232123 is a wasteful number, since it uses less digits than its factorization.

21331232123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581145.

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

Adding to 21331232123 its reverse (32123213312), we get a palindrome (53454445435).

The spelling of 21331232123 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-two thousand, one hundred twenty-three".