35821021 has 4 divisors (see below), whose sum is σ = 36654112. Its totient is φ = 34987932.

The previous prime is 35821001. The next prime is 35821039. The reversal of 35821021 is 12012853.

35821021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12012853 = 997 ⋅12049.

It is a cyclic number.

It is not a de Polignac number, because 35821021 - 2⁷ = 35820893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 35820983 and 35821001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35821001) 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 3 ways as a sum of consecutive naturals, for example, 416481 + ... + 416566.

It is an arithmetic number, because the mean of its divisors is an integer number (9163528).

Almost surely, 2^35821021 is an apocalyptic number.

It is an amenable number.

35821021 is a deficient number, since it is larger than the sum of its proper divisors (833091).

35821021 is an equidigital number, since it uses as much as digits as its factorization.

35821021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833090.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 35821021 is about 5985.0664992129. The cubic root of 35821021 is about 329.6446158861.

Adding to 35821021 its reverse (12012853), we get a palindrome (47833874).

The spelling of 35821021 in words is "thirty-five million, eight hundred twenty-one thousand, twenty-one".