4205521222021 has 16 divisors (see below), whose sum is σ = 4878364433920. Its totient is φ = 3550698653040.

The previous prime is 4205521222003. The next prime is 4205521222027. The reversal of 4205521222021 is 1202221255024.

4205521222021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4205521222021 - 2²⁷ = 4205387004293 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 (4205521222027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7096726 + ... + 7666456.

It is an arithmetic number, because the mean of its divisors is an integer number (304897777120).

Almost surely, 2^{4205521222021} is an apocalyptic number.

It is an amenable number.

4205521222021 is a deficient number, since it is larger than the sum of its proper divisors (672843211899).

4205521222021 is a wasteful number, since it uses less digits than its factorization.

4205521222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585544.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 4205521222021 its reverse (1202221255024), we get a palindrome (5407742477045).

The spelling of 4205521222021 in words is "four trillion, two hundred five billion, five hundred twenty-one million, two hundred twenty-two thousand, twenty-one".