21333210023 has 4 divisors (see below), whose sum is σ = 21336140880. Its totient is φ = 21330279168.

The previous prime is 21333210011. The next prime is 21333210061. The reversal of 21333210023 is 32001233312.

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 21333210023 - 2⁶ = 21333209959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333209977 and 21333210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333210823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454483 + ... + 1469076.

It is an arithmetic number, because the mean of its divisors is an integer number (5334035220).

Almost surely, 2^21333210023 is an apocalyptic number.

21333210023 is a deficient number, since it is larger than the sum of its proper divisors (2930857).

21333210023 is an equidigital number, since it uses as much as digits as its factorization.

21333210023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930856.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21333210023 its reverse (32001233312), we get a palindrome (53334443335).

The spelling of 21333210023 in words is "twenty-one billion, three hundred thirty-three million, two hundred ten thousand, twenty-three".