421270181 has 2 divisors, whose sum is σ = 421270182. Its totient is φ = 421270180.

The previous prime is 421270159. The next prime is 421270189. The reversal of 421270181 is 181072124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320589025 + 100681156 = 17905^2 + 10034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421270181 is a prime.

It is a super-2 number, since 2×421270181² = 354937130799545522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421270181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421270189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210635090 + 210635091.

It is an arithmetic number, because the mean of its divisors is an integer number (210635091).

Almost surely, 2^421270181 is an apocalyptic number.

It is an amenable number.

421270181 is a deficient number, since it is larger than the sum of its proper divisors (1).

421270181 is an equidigital number, since it uses as much as digits as its factorization.

421270181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 421270181 is about 20524.8673808139. The cubic root of 421270181 is about 749.6414173260.

The spelling of 421270181 in words is "four hundred twenty-one million, two hundred seventy thousand, one hundred eighty-one".