421550055181 has 2 divisors, whose sum is σ = 421550055182. Its totient is φ = 421550055180.

The previous prime is 421550055107. The next prime is 421550055193. The reversal of 421550055181 is 181550055124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223606036900 + 197944018281 = 472870^2 + 444909^2 .

It is a cyclic number.

It is not a de Polignac number, because 421550055181 - 2⁷ = 421550055053 is a prime.

It is a super-2 number, since 2×421550055181² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421550055181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421550055881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210775027590 + 210775027591.

It is an arithmetic number, because the mean of its divisors is an integer number (210775027591).

Almost surely, 2^421550055181 is an apocalyptic number.

It is an amenable number.

421550055181 is a deficient number, since it is larger than the sum of its proper divisors (1).

421550055181 is an equidigital number, since it uses as much as digits as its factorization.

421550055181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40000, while the sum is 37.

The spelling of 421550055181 in words is "four hundred twenty-one billion, five hundred fifty million, fifty-five thousand, one hundred eighty-one".