21201320333 has 4 divisors (see below), whose sum is σ = 21203294400. Its totient is φ = 21199346268.

The previous prime is 21201320317. The next prime is 21201320341. The reversal of 21201320333 is 33302310212.

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 a cyclic number.

It is not a de Polignac number, because 21201320333 - 2⁴ = 21201320317 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 (21201320233) 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, 970835 + ... + 992432.

It is an arithmetic number, because the mean of its divisors is an integer number (5300823600).

Almost surely, 2^21201320333 is an apocalyptic number.

It is an amenable number.

21201320333 is a deficient number, since it is larger than the sum of its proper divisors (1974067).

21201320333 is a wasteful number, since it uses less digits than its factorization.

21201320333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974066.

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

Adding to 21201320333 its reverse (33302310212), we get a palindrome (54503630545).

The spelling of 21201320333 in words is "twenty-one billion, two hundred one million, three hundred twenty thousand, three hundred thirty-three".