4352220021 has 4 divisors (see below), whose sum is σ = 5802960032. Its totient is φ = 2901480012.

The previous prime is 4352219953. The next prime is 4352220083. The reversal of 4352220021 is 1200222534.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4352220021 - 2²⁶ = 4285111157 is a prime.

It is a super-2 number, since 2×4352220021² = 37883638222386480882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4352220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4352220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725370001 + ... + 725370006.

It is an arithmetic number, because the mean of its divisors is an integer number (1450740008).

Almost surely, 2^4352220021 is an apocalyptic number.

It is an amenable number.

4352220021 is a deficient number, since it is larger than the sum of its proper divisors (1450740011).

4352220021 is a wasteful number, since it uses less digits than its factorization.

4352220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450740010.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 4352220021 is about 65971.3575803924. The cubic root of 4352220021 is about 1632.6895540851.

Adding to 4352220021 its reverse (1200222534), we get a palindrome (5552442555).

The spelling of 4352220021 in words is "four billion, three hundred fifty-two million, two hundred twenty thousand, twenty-one".