4253530021 has 16 divisors (see below), whose sum is σ = 4746818160. Its totient is φ = 3784435200.

The previous prime is 4253530009. The next prime is 4253530091. The reversal of 4253530021 is 1200353524.

It can be written as a sum of positive squares in 8 ways, for example, as 591948900 + 3661581121 = 24330^2 + 60511^2 .

It is not a de Polignac number, because 4253530021 - 2⁵ = 4253529989 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 (4253530091) 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, 217191 + ... + 235963.

It is an arithmetic number, because the mean of its divisors is an integer number (296676135).

Almost surely, 2^4253530021 is an apocalyptic number.

It is an amenable number.

4253530021 is a deficient number, since it is larger than the sum of its proper divisors (493288139).

4253530021 is a wasteful number, since it uses less digits than its factorization.

4253530021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19416.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 4253530021 is about 65219.0924576538. The cubic root of 4253530021 is about 1620.2542431077.

Adding to 4253530021 its reverse (1200353524), we get a palindrome (5453883545).

The spelling of 4253530021 in words is "four billion, two hundred fifty-three million, five hundred thirty thousand, twenty-one".