21423033223 has 4 divisors (see below), whose sum is σ = 21476457648. Its totient is φ = 21369608800.

The previous prime is 21423033211. The next prime is 21423033253. The reversal of 21423033223 is 32233032412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21423033223 - 2³³ = 12833098631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423033253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26711611 + ... + 26712412.

It is an arithmetic number, because the mean of its divisors is an integer number (5369114412).

Almost surely, 2^21423033223 is an apocalyptic number.

21423033223 is a deficient number, since it is larger than the sum of its proper divisors (53424425).

21423033223 is an equidigital number, since it uses as much as digits as its factorization.

21423033223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53424424.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21423033223 its reverse (32233032412), we get a palindrome (53656065635).

The spelling of 21423033223 in words is "twenty-one billion, four hundred twenty-three million, thirty-three thousand, two hundred twenty-three".