4055042021 has 2 divisors, whose sum is σ = 4055042022. Its totient is φ = 4055042020.

The previous prime is 4055042009. The next prime is 4055042027. The reversal of 4055042021 is 1202405504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3162825121 + 892216900 = 56239^2 + 29870^2 .

It is a cyclic number.

It is not a de Polignac number, because 4055042021 - 2¹⁸ = 4054779877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4055042027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2027521010 + 2027521011.

It is an arithmetic number, because the mean of its divisors is an integer number (2027521011).

Almost surely, 2^4055042021 is an apocalyptic number.

It is an amenable number.

4055042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4055042021 is an equidigital number, since it uses as much as digits as its factorization.

4055042021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 4055042021 is about 63679.2118434266. The cubic root of 4055042021 is about 1594.6490543802.

Adding to 4055042021 its reverse (1202405504), we get a palindrome (5257447525).

The spelling of 4055042021 in words is "four billion, fifty-five million, forty-two thousand, twenty-one".