2421378181 has 2 divisors, whose sum is σ = 2421378182. Its totient is φ = 2421378180.

The previous prime is 2421378137. The next prime is 2421378209. The reversal of 2421378181 is 1818731242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1761145156 + 660233025 = 41966^2 + 25695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421378181 - 2¹⁹ = 2420853893 is a prime.

It is a super-2 number, since 2×2421378181² = 11726144590845737522, 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 2421378181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421378121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210689090 + 1210689091.

It is an arithmetic number, because the mean of its divisors is an integer number (1210689091).

Almost surely, 2^2421378181 is an apocalyptic number.

It is an amenable number.

2421378181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421378181 is an equidigital number, since it uses as much as digits as its factorization.

2421378181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 2421378181 is about 49207.5012675913. The cubic root of 2421378181 is about 1342.8295043154.

The spelling of 2421378181 in words is "two billion, four hundred twenty-one million, three hundred seventy-eight thousand, one hundred eighty-one".