4021041221 has 2 divisors, whose sum is σ = 4021041222. Its totient is φ = 4021041220.

The previous prime is 4021041209. The next prime is 4021041239. The reversal of 4021041221 is 1221401204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3816150625 + 204890596 = 61775^2 + 14314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021041221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021041221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021041721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010520610 + 2010520611.

It is an arithmetic number, because the mean of its divisors is an integer number (2010520611).

Almost surely, 2^4021041221 is an apocalyptic number.

It is an amenable number.

4021041221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021041221 is an equidigital number, since it uses as much as digits as its factorization.

4021041221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 4021041221 is about 63411.6804776533. The cubic root of 4021041221 is about 1590.1795903576.

Adding to 4021041221 its reverse (1221401204), we get a palindrome (5242442425).

The spelling of 4021041221 in words is "four billion, twenty-one million, forty-one thousand, two hundred twenty-one".