21233112321 has 8 divisors (see below), whose sum is σ = 28337757664. Its totient is φ = 14141937600.

The previous prime is 21233112301. The next prime is 21233112367. The reversal of 21233112321 is 12321133212.

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

It is not a de Polignac number, because 21233112321 - 2⁵ = 21233112289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233112301) 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, 3363976 + ... + 3370281.

It is an arithmetic number, because the mean of its divisors is an integer number (3542219708).

Almost surely, 2^21233112321 is an apocalyptic number.

It is an amenable number.

21233112321 is a deficient number, since it is larger than the sum of its proper divisors (7104645343).

21233112321 is a wasteful number, since it uses less digits than its factorization.

21233112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735311.

The product of its digits is 432, while the sum is 21.

Adding to 21233112321 its reverse (12321133212), we get a palindrome (33554245533).

The spelling of 21233112321 in words is "twenty-one billion, two hundred thirty-three million, one hundred twelve thousand, three hundred twenty-one".