21423230033 has 4 divisors (see below), whose sum is σ = 21694410240. Its totient is φ = 21152049828.

The previous prime is 21423229981. The next prime is 21423230053. The reversal of 21423230033 is 33003232412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21423230033 - 2¹⁴ = 21423213649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21423229990 and 21423230008.

It is not an unprimeable number, because it can be changed into a prime (21423230053) 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, 135589985 + ... + 135590142.

It is an arithmetic number, because the mean of its divisors is an integer number (5423602560).

Almost surely, 2^21423230033 is an apocalyptic number.

It is an amenable number.

21423230033 is a deficient number, since it is larger than the sum of its proper divisors (271180207).

21423230033 is an equidigital number, since it uses as much as digits as its factorization.

21423230033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271180206.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21423230033 its reverse (33003232412), we get a palindrome (54426462445).

The spelling of 21423230033 in words is "twenty-one billion, four hundred twenty-three million, two hundred thirty thousand, thirty-three".