21120233223 has 8 divisors (see below), whose sum is σ = 28382046208. Its totient is φ = 13969287864.

The previous prime is 21120233209. The next prime is 21120233227. The reversal of 21120233223 is 32233202112.

It is a happy number.

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

It is not a de Polignac number, because 21120233223 - 2²² = 21116038919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120233223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120233227) 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, 27716461 + ... + 27717222.

It is an arithmetic number, because the mean of its divisors is an integer number (3547755776).

Almost surely, 2^21120233223 is an apocalyptic number.

21120233223 is a deficient number, since it is larger than the sum of its proper divisors (7261812985).

21120233223 is a wasteful number, since it uses less digits than its factorization.

21120233223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55433813.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21120233223 its reverse (32233202112), we get a palindrome (53353435335).

The spelling of 21120233223 in words is "twenty-one billion, one hundred twenty million, two hundred thirty-three thousand, two hundred twenty-three".