21121321333 has 8 divisors (see below), whose sum is σ = 24429480768. Its totient is φ = 17885868864.

The previous prime is 21121321327. The next prime is 21121321349. The reversal of 21121321333 is 33312312112.

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 21121321333 - 2⁵ = 21121321301 is a prime.

It is a super-2 number, since 2×21121321333² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121321433) 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, 18176116 + ... + 18177277.

It is an arithmetic number, because the mean of its divisors is an integer number (3053685096).

Almost surely, 2^21121321333 is an apocalyptic number.

It is an amenable number.

21121321333 is a deficient number, since it is larger than the sum of its proper divisors (3308159435).

21121321333 is an equidigital number, since it uses as much as digits as its factorization.

21121321333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36353483.

The product of its digits is 648, while the sum is 22.

Adding to 21121321333 its reverse (33312312112), we get a palindrome (54433633445).

The spelling of 21121321333 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty-three".