4021254161 has 2 divisors, whose sum is σ = 4021254162. Its totient is φ = 4021254160.

The previous prime is 4021254119. The next prime is 4021254191. The reversal of 4021254161 is 1614521204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2896054225 + 1125199936 = 53815^2 + 33544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021254161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4021254161.

It is not a weakly prime, because it can be changed into another prime (4021254101) 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, 2010627080 + 2010627081.

It is an arithmetic number, because the mean of its divisors is an integer number (2010627081).

Almost surely, 2^4021254161 is an apocalyptic number.

It is an amenable number.

4021254161 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021254161 is an equidigital number, since it uses as much as digits as its factorization.

4021254161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 4021254161 is about 63413.3594836293. The cubic root of 4021254161 is about 1590.2076599417.

Adding to 4021254161 its reverse (1614521204), we get a palindrome (5635775365).

The spelling of 4021254161 in words is "four billion, twenty-one million, two hundred fifty-four thousand, one hundred sixty-one".