21221121333 has 4 divisors (see below), whose sum is σ = 28294828448. Its totient is φ = 14147414220.

The previous prime is 21221121283. The next prime is 21221121349. The reversal of 21221121333 is 33312112212.

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 not a de Polignac number, because 21221121333 - 2¹² = 21221117237 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 (21221121353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536853553 + ... + 3536853558.

It is an arithmetic number, because the mean of its divisors is an integer number (7073707112).

Almost surely, 2^21221121333 is an apocalyptic number.

It is an amenable number.

21221121333 is a deficient number, since it is larger than the sum of its proper divisors (7073707115).

21221121333 is an equidigital number, since it uses as much as digits as its factorization.

21221121333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073707114.

The product of its digits is 432, while the sum is 21.

Adding to 21221121333 its reverse (33312112212), we get a palindrome (54533233545).

The spelling of 21221121333 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred thirty-three".