21012320333 has 8 divisors (see below), whose sum is σ = 21050090880. Its totient is φ = 20974575600.

The previous prime is 21012320317. The next prime is 21012320347. The reversal of 21012320333 is 33302321012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012320333 - 2⁴ = 21012320317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012320233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2343008 + ... + 2351958.

It is an arithmetic number, because the mean of its divisors is an integer number (2631261360).

Almost surely, 2^21012320333 is an apocalyptic number.

It is an amenable number.

21012320333 is a deficient number, since it is larger than the sum of its proper divisors (37770547).

21012320333 is an equidigital number, since it uses as much as digits as its factorization.

21012320333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12907.

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

Adding to 21012320333 its reverse (33302321012), we get a palindrome (54314641345).

The spelling of 21012320333 in words is "twenty-one billion, twelve million, three hundred twenty thousand, three hundred thirty-three".