55543032121 has 2 divisors, whose sum is σ = 55543032122. Its totient is φ = 55543032120.

The previous prime is 55543032119. The next prime is 55543032137. The reversal of 55543032121 is 12123034555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39142644025 + 16400388096 = 197845^2 + 128064^2 .

It is a cyclic number.

It is not a de Polignac number, because 55543032121 - 2¹ = 55543032119 is a prime.

Together with 55543032119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55543032421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27771516060 + 27771516061.

It is an arithmetic number, because the mean of its divisors is an integer number (27771516061).

Almost surely, 2^55543032121 is an apocalyptic number.

It is an amenable number.

55543032121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55543032121 is an equidigital number, since it uses as much as digits as its factorization.

55543032121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 55543032121 its reverse (12123034555), we get a palindrome (67666066676).

The spelling of 55543032121 in words is "fifty-five billion, five hundred forty-three million, thirty-two thousand, one hundred twenty-one".