555212212421 has 2 divisors, whose sum is σ = 555212212422. Its totient is φ = 555212212420.

The previous prime is 555212212403. The next prime is 555212212469. The reversal of 555212212421 is 124212212555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 326025012196 + 229187200225 = 570986^2 + 478735^2 .

It is a cyclic number.

It is not a de Polignac number, because 555212212421 - 2³⁴ = 538032343237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555212212021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277606106210 + 277606106211.

It is an arithmetic number, because the mean of its divisors is an integer number (277606106211).

Almost surely, 2^555212212421 is an apocalyptic number.

It is an amenable number.

555212212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

555212212421 is an equidigital number, since it uses as much as digits as its factorization.

555212212421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16000, while the sum is 32.

Adding to 555212212421 its reverse (124212212555), we get a palindrome (679424424976).

The spelling of 555212212421 in words is "five hundred fifty-five billion, two hundred twelve million, two hundred twelve thousand, four hundred twenty-one".