55220441131421 has 2 divisors, whose sum is σ = 55220441131422. Its totient is φ = 55220441131420.

The previous prime is 55220441131367. The next prime is 55220441131433. The reversal of 55220441131421 is 12413114402255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44143931928100 + 11076509203321 = 6644090^2 + 3328139^2 .

It is a cyclic number.

It is not a de Polignac number, because 55220441131421 - 2²⁶ = 55220374022557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55220441131321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610220565710 + 27610220565711.

It is an arithmetic number, because the mean of its divisors is an integer number (27610220565711).

Almost surely, 2^{55220441131421} is an apocalyptic number.

It is an amenable number.

55220441131421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55220441131421 is an equidigital number, since it uses as much as digits as its factorization.

55220441131421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 55220441131421 its reverse (12413114402255), we get a palindrome (67633555533676).

The spelling of 55220441131421 in words is "fifty-five trillion, two hundred twenty billion, four hundred forty-one million, one hundred thirty-one thousand, four hundred twenty-one".