555156421021 has 2 divisors, whose sum is σ = 555156421022. Its totient is φ = 555156421020.

The previous prime is 555156420983. The next prime is 555156421067. The reversal of 555156421021 is 120124651555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446858825625 + 108297595396 = 668475^2 + 329086^2 .

It is a cyclic number.

It is not a de Polignac number, because 555156421021 - 2⁹ = 555156420509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555156421091) 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, 277578210510 + 277578210511.

It is an arithmetic number, because the mean of its divisors is an integer number (277578210511).

Almost surely, 2^555156421021 is an apocalyptic number.

It is an amenable number.

555156421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

555156421021 is an equidigital number, since it uses as much as digits as its factorization.

555156421021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 555156421021 in words is "five hundred fifty-five billion, one hundred fifty-six million, four hundred twenty-one thousand, twenty-one".