21320221121333 has 4 divisors (see below), whose sum is σ = 21320242064748. Its totient is φ = 21320200177920.

The previous prime is 21320221121317. The next prime is 21320221121341. The reversal of 21320221121333 is 33312112202312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14094753472804 + 7225467648529 = 3754298^2 + 2688023^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320221121333 - 2⁴ = 21320221121317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320221121363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8862266 + ... + 11008187.

It is an arithmetic number, because the mean of its divisors is an integer number (5330060516187).

Almost surely, 2^{21320221121333} is an apocalyptic number.

It is an amenable number.

21320221121333 is a deficient number, since it is larger than the sum of its proper divisors (20943415).

21320221121333 is a wasteful number, since it uses less digits than its factorization.

21320221121333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20943414.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21320221121333 its reverse (33312112202312), we get a palindrome (54632333323645).

The spelling of 21320221121333 in words is "twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred thirty-three".