21333123001 has 8 divisors (see below), whose sum is σ = 22265680320. Its totient is φ = 20400984912.

The previous prime is 21333122983. The next prime is 21333123011. The reversal of 21333123001 is 10032133312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21333123001 - 2⁵ = 21333122969 is a prime.

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 21333123001.

It is not an unprimeable number, because it can be changed into a prime (21333123011) 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 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 206563.

It is an arithmetic number, because the mean of its divisors is an integer number (2783210040).

Almost surely, 2^21333123001 is an apocalyptic number.

It is an amenable number.

21333123001 is a deficient number, since it is larger than the sum of its proper divisors (932557319).

21333123001 is a wasteful number, since it uses less digits than its factorization.

21333123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209615.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21333123001 its reverse (10032133312), we get a palindrome (31365256313).

The spelling of 21333123001 in words is "twenty-one billion, three hundred thirty-three million, one hundred twenty-three thousand, one".