4040205121 has 6 divisors (see below), whose sum is σ = 4152352470. Its totient is φ = 3931009056.

The previous prime is 4040205109. The next prime is 4040205133. The reversal of 4040205121 is 1215020404.

It is an interprime number because it is at equal distance from previous prime (4040205109) and next prime (4040205133).

It can be written as a sum of positive squares in 3 ways, for example, as 1483790400 + 2556414721 = 38520^2 + 50561^2 .

It is not a de Polignac number, because 4040205121 - 2¹³ = 4040196929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4040205101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1474236 + ... + 1476973.

It is an arithmetic number, because the mean of its divisors is an integer number (692058745).

Almost surely, 2^4040205121 is an apocalyptic number.

It is an amenable number.

4040205121 is a deficient number, since it is larger than the sum of its proper divisors (112147349).

4040205121 is an equidigital number, since it uses as much as digits as its factorization.

4040205121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951283 (or 2951246 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 4040205121 is about 63562.6078838809. The cubic root of 4040205121 is about 1592.7018026094.

Adding to 4040205121 its reverse (1215020404), we get a palindrome (5255225525).

The spelling of 4040205121 in words is "four billion, forty million, two hundred five thousand, one hundred twenty-one".