21531433022273 has 2 divisors, whose sum is σ = 21531433022274. Its totient is φ = 21531433022272.

The previous prime is 21531433022219. The next prime is 21531433022299. The reversal of 21531433022273 is 37222033413512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18441811238449 + 3089621783824 = 4294393^2 + 1757732^2 .

It is a cyclic number.

It is not a de Polignac number, because 21531433022273 - 2¹⁴ = 21531433005889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21531433022173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765716511136 + 10765716511137.

It is an arithmetic number, because the mean of its divisors is an integer number (10765716511137).

Almost surely, 2^{21531433022273} is an apocalyptic number.

It is an amenable number.

21531433022273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21531433022273 is an equidigital number, since it uses as much as digits as its factorization.

21531433022273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 38.

Adding to 21531433022273 its reverse (37222033413512), we get a palindrome (58753466435785).

The spelling of 21531433022273 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty-three million, twenty-two thousand, two hundred seventy-three".