55871212321 has 2 divisors, whose sum is σ = 55871212322. Its totient is φ = 55871212320.

The previous prime is 55871212307. The next prime is 55871212333. The reversal of 55871212321 is 12321217855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43917070096 + 11954142225 = 209564^2 + 109335^2 .

It is a cyclic number.

It is not a de Polignac number, because 55871212321 - 2¹¹ = 55871210273 is a prime.

It is not a weakly prime, because it can be changed into another prime (55871212361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935606160 + 27935606161.

It is an arithmetic number, because the mean of its divisors is an integer number (27935606161).

Almost surely, 2^55871212321 is an apocalyptic number.

It is an amenable number.

55871212321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55871212321 is an equidigital number, since it uses as much as digits as its factorization.

55871212321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The spelling of 55871212321 in words is "fifty-five billion, eight hundred seventy-one million, two hundred twelve thousand, three hundred twenty-one".