4205652821 has 4 divisors (see below), whose sum is σ = 4212016044. Its totient is φ = 4199289600.

The previous prime is 4205652817. The next prime is 4205652823. The reversal of 4205652821 is 1282565024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3358202500 + 847450321 = 57950^2 + 29111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4205652821 - 2² = 4205652817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4205652823) 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 in 3 ways as a sum of consecutive naturals, for example, 3180620 + ... + 3181941.

It is an arithmetic number, because the mean of its divisors is an integer number (1053004011).

Almost surely, 2^4205652821 is an apocalyptic number.

It is an amenable number.

4205652821 is a deficient number, since it is larger than the sum of its proper divisors (6363223).

4205652821 is an equidigital number, since it uses as much as digits as its factorization.

4205652821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6363222.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 4205652821 is about 64851.0047801883. The cubic root of 4205652821 is about 1614.1521646462.

The spelling of 4205652821 in words is "four billion, two hundred five million, six hundred fifty-two thousand, eight hundred twenty-one".