21000123001333 has 4 divisors (see below), whose sum is σ = 24000140572960. Its totient is φ = 18000105429708.

The previous prime is 21000123001327. The next prime is 21000123001339. The reversal of 21000123001333 is 33310032100012.

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 an interprime number because it is at equal distance from previous prime (21000123001327) and next prime (21000123001339).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000123001333 is a prime.

It is a super-2 number, since 2×21000123001333² (a number of 27 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 21000123001333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000123001339) 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, 1500008785803 + ... + 1500008785816.

It is an arithmetic number, because the mean of its divisors is an integer number (6000035143240).

Almost surely, 2^{21000123001333} is an apocalyptic number.

It is an amenable number.

21000123001333 is a deficient number, since it is larger than the sum of its proper divisors (3000017571627).

21000123001333 is an equidigital number, since it uses as much as digits as its factorization.

21000123001333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000017571626.

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

Adding to 21000123001333 its reverse (33310032100012), we get a palindrome (54310155101345).

The spelling of 21000123001333 in words is "twenty-one trillion, one hundred twenty-three million, one thousand, three hundred thirty-three".