1055531550221 has 2 divisors, whose sum is σ = 1055531550222. Its totient is φ = 1055531550220.

The previous prime is 1055531550193. The next prime is 1055531550233. The reversal of 1055531550221 is 1220551355501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1026191286121 + 29340264100 = 1013011^2 + 171290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055531550221 - 2³⁸ = 780653643277 is a prime.

It is a super-2 number, since 2×1055531550221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1055531550721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527765775110 + 527765775111.

It is an arithmetic number, because the mean of its divisors is an integer number (527765775111).

Almost surely, 2^{1055531550221} is an apocalyptic number.

It is an amenable number.

1055531550221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055531550221 is an equidigital number, since it uses as much as digits as its factorization.

1055531550221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37500, while the sum is 35.

The spelling of 1055531550221 in words is "one trillion, fifty-five billion, five hundred thirty-one million, five hundred fifty thousand, two hundred twenty-one".