21035232321 has 16 divisors (see below), whose sum is σ = 28175152128. Its totient is φ = 13959475200.

The previous prime is 21035232287. The next prime is 21035232343. The reversal of 21035232321 is 12323253012.

It is a happy number.

It is not a de Polignac number, because 21035232321 - 2¹¹ = 21035230273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21035232291 and 21035232300.

It is not an unprimeable number, because it can be changed into a prime (21035232391) 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, 1241376 + ... + 1258206.

It is an arithmetic number, because the mean of its divisors is an integer number (1760947008).

Almost surely, 2^21035232321 is an apocalyptic number.

It is an amenable number.

21035232321 is a deficient number, since it is larger than the sum of its proper divisors (7139919807).

21035232321 is a wasteful number, since it uses less digits than its factorization.

21035232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18712.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21035232321 its reverse (12323253012), we get a palindrome (33358485333).

The spelling of 21035232321 in words is "twenty-one billion, thirty-five million, two hundred thirty-two thousand, three hundred twenty-one".