561055106021 has 2 divisors, whose sum is σ = 561055106022. Its totient is φ = 561055106020.

The previous prime is 561055105987. The next prime is 561055106077. The reversal of 561055106021 is 120601550165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410810493025 + 150244612996 = 640945^2 + 387614^2 .

It is a cyclic number.

It is not a de Polignac number, because 561055106021 - 2³⁴ = 543875236837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561055106221) 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, 280527553010 + 280527553011.

It is an arithmetic number, because the mean of its divisors is an integer number (280527553011).

Almost surely, 2^561055106021 is an apocalyptic number.

It is an amenable number.

561055106021 is a deficient number, since it is larger than the sum of its proper divisors (1).

561055106021 is an equidigital number, since it uses as much as digits as its factorization.

561055106021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 561055106021 its reverse (120601550165), we get a palindrome (681656656186).

The spelling of 561055106021 in words is "five hundred sixty-one billion, fifty-five million, one hundred six thousand, twenty-one".