21333312023 has 4 divisors (see below), whose sum is σ = 21625549248. Its totient is φ = 21041074800.

The previous prime is 21333312001. The next prime is 21333312029. The reversal of 21333312023 is 32021333312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333312023 is a prime.

It is a super-2 number, since 2×21333312023² (a number of 21 digits) contains 22 as substring.

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 21333312023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333312029) 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, 146118503 + ... + 146118648.

It is an arithmetic number, because the mean of its divisors is an integer number (5406387312).

Almost surely, 2^21333312023 is an apocalyptic number.

21333312023 is a deficient number, since it is larger than the sum of its proper divisors (292237225).

21333312023 is an equidigital number, since it uses as much as digits as its factorization.

21333312023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292237224.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21333312023 its reverse (32021333312), we get a palindrome (53354645335).

The spelling of 21333312023 in words is "twenty-one billion, three hundred thirty-three million, three hundred twelve thousand, twenty-three".