21000233223 has 24 divisors (see below), whose sum is σ = 30744467520. Its totient is φ = 13810867200.

The previous prime is 21000233213. The next prime is 21000233273. The reversal of 21000233223 is 32233200012.

It is a happy number.

21000233223 is a `hidden beast` number, since 210 + 0 + 0 + 233 + 223 = 666.

It is not a de Polignac number, because 21000233223 - 2¹⁸ = 20999971079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000233196 and 21000233205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000233203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841615 + ... + 866207.

It is an arithmetic number, because the mean of its divisors is an integer number (1281019480).

Almost surely, 2^21000233223 is an apocalyptic number.

21000233223 is a deficient number, since it is larger than the sum of its proper divisors (9744234297).

21000233223 is a wasteful number, since it uses less digits than its factorization.

21000233223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25879 (or 25876 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21000233223 its reverse (32233200012), we get a palindrome (53233433235).

The spelling of 21000233223 in words is "twenty-one billion, two hundred thirty-three thousand, two hundred twenty-three".