21238329 has 8 divisors (see below), whose sum is σ = 32363200. Its totient is φ = 12136176.

The previous prime is 21238307. The next prime is 21238351. The reversal of 21238329 is 92383212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21238307) and next prime (21238351).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21238329 - 2⁸ = 21238073 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21238296 and 21238305.

It is not an unprimeable number, because it can be changed into a prime (21238229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505654 + ... + 505695.

It is an arithmetic number, because the mean of its divisors is an integer number (4045400).

Almost surely, 2^21238329 is an apocalyptic number.

It is an amenable number.

21238329 is a deficient number, since it is larger than the sum of its proper divisors (11124871).

21238329 is a wasteful number, since it uses less digits than its factorization.

21238329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011359.

The product of its digits is 5184, while the sum is 30.

The square root of 21238329 is about 4608.5061570969. The cubic root of 21238329 is about 276.9321950405.

The spelling of 21238329 in words is "twenty-one million, two hundred thirty-eight thousand, three hundred twenty-nine".