4021555441 has 2 divisors, whose sum is σ = 4021555442. Its totient is φ = 4021555440.

The previous prime is 4021555427. The next prime is 4021555469. The reversal of 4021555441 is 1445551204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3308665441 + 712890000 = 57521^2 + 26700^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021555441 - 2¹⁹ = 4021031153 is a prime.

It is not a weakly prime, because it can be changed into another prime (4021525441) 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, 2010777720 + 2010777721.

It is an arithmetic number, because the mean of its divisors is an integer number (2010777721).

Almost surely, 2^4021555441 is an apocalyptic number.

It is an amenable number.

4021555441 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021555441 is an equidigital number, since it uses as much as digits as its factorization.

4021555441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 4021555441 is about 63415.7349638085. The cubic root of 4021555441 is about 1590.2473727428.

The spelling of 4021555441 in words is "four billion, twenty-one million, five hundred fifty-five thousand, four hundred forty-one".