21013329 has 8 divisors (see below), whose sum is σ = 29236032. Its totient is φ = 13399760.

The previous prime is 21013303. The next prime is 21013357. The reversal of 21013329 is 92331012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21013329 - 2⁸ = 21013073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21013379) 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, 152202 + ... + 152339.

It is an arithmetic number, because the mean of its divisors is an integer number (3654504).

Almost surely, 2^21013329 is an apocalyptic number.

It is an amenable number.

21013329 is a deficient number, since it is larger than the sum of its proper divisors (8222703).

21013329 is a wasteful number, since it uses less digits than its factorization.

21013329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304567.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21013329 is about 4584.0297773902. The cubic root of 21013329 is about 275.9507762458.

The spelling of 21013329 in words is "twenty-one million, thirteen thousand, three hundred twenty-nine".