2153331521321 has 2 divisors, whose sum is σ = 2153331521322. Its totient is φ = 2153331521320.

The previous prime is 2153331521293. The next prime is 2153331521357. The reversal of 2153331521321 is 1231251333512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1536635431321 + 616696090000 = 1239611^2 + 785300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153331521321 - 2¹⁰ = 2153331520297 is a prime.

It is a super-2 number, since 2×2153331521321² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2153331521521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076665760660 + 1076665760661.

It is an arithmetic number, because the mean of its divisors is an integer number (1076665760661).

Almost surely, 2^{2153331521321} is an apocalyptic number.

It is an amenable number.

2153331521321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153331521321 is an equidigital number, since it uses as much as digits as its factorization.

2153331521321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

Adding to 2153331521321 its reverse (1231251333512), we get a palindrome (3384582854833).

The spelling of 2153331521321 in words is "two trillion, one hundred fifty-three billion, three hundred thirty-one million, five hundred twenty-one thousand, three hundred twenty-one".