21120329 has 4 divisors (see below), whose sum is σ = 21179520. Its totient is φ = 21061140.

The previous prime is 21120317. The next prime is 21120349. The reversal of 21120329 is 92302112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120329.

It is not an unprimeable number, because it can be changed into a prime (21120349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29057 + ... + 29774.

It is an arithmetic number, because the mean of its divisors is an integer number (5294880).

Almost surely, 2^21120329 is an apocalyptic number.

It is an amenable number.

21120329 is a deficient number, since it is larger than the sum of its proper divisors (59191).

21120329 is an equidigital number, since it uses as much as digits as its factorization.

21120329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59190.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21120329 is about 4595.6859118090. The cubic root of 21120329 is about 276.4183645019.

The spelling of 21120329 in words is "twenty-one million, one hundred twenty thousand, three hundred twenty-nine".