21241329 has 4 divisors (see below), whose sum is σ = 28321776. Its totient is φ = 14160884.

The previous prime is 21241327. The next prime is 21241331. The reversal of 21241329 is 92314212.

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 an interprime number because it is at equal distance from previous prime (21241327) and next prime (21241331).

It is a cyclic number.

It is not a de Polignac number, because 21241329 - 2¹ = 21241327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21241299 and 21241308.

It is not an unprimeable number, because it can be changed into a prime (21241327) 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, 3540219 + ... + 3540224.

It is an arithmetic number, because the mean of its divisors is an integer number (7080444).

Almost surely, 2^21241329 is an apocalyptic number.

It is an amenable number.

21241329 is a deficient number, since it is larger than the sum of its proper divisors (7080447).

21241329 is an equidigital number, since it uses as much as digits as its factorization.

21241329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080446.

The product of its digits is 864, while the sum is 24.

The square root of 21241329 is about 4608.8316306847. The cubic root of 21241329 is about 276.9452336913.

The spelling of 21241329 in words is "twenty-one million, two hundred forty-one thousand, three hundred twenty-nine".