55433431321 has 2 divisors, whose sum is σ = 55433431322. Its totient is φ = 55433431320.

The previous prime is 55433431283. The next prime is 55433431337. The reversal of 55433431321 is 12313433455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30282960400 + 25150470921 = 174020^2 + 158589^2 .

It is a cyclic number.

It is not a de Polignac number, because 55433431321 - 2¹⁷ = 55433300249 is a prime.

It is not a weakly prime, because it can be changed into another prime (55433431721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27716715660 + 27716715661.

It is an arithmetic number, because the mean of its divisors is an integer number (27716715661).

Almost surely, 2^55433431321 is an apocalyptic number.

It is an amenable number.

55433431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55433431321 is an equidigital number, since it uses as much as digits as its factorization.

55433431321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 34.

Adding to 55433431321 its reverse (12313433455), we get a palindrome (67746864776).

The spelling of 55433431321 in words is "fifty-five billion, four hundred thirty-three million, four hundred thirty-one thousand, three hundred twenty-one".