21267329 has 4 divisors (see below), whose sum is σ = 21374400. Its totient is φ = 21160260.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267329 is 92376212.

It is a happy number.

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 not a de Polignac number, because 21267329 - 2¹² = 21263233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21267295 and 21267304.

It is not an unprimeable number, because it can be changed into a prime (21260329) 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, 53237 + ... + 53634.

It is an arithmetic number, because the mean of its divisors is an integer number (5343600).

Almost surely, 2^21267329 is an apocalyptic number.

It is an amenable number.

21267329 is a deficient number, since it is larger than the sum of its proper divisors (107071).

21267329 is a wasteful number, since it uses less digits than its factorization.

21267329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107070.

The product of its digits is 9072, while the sum is 32.

The square root of 21267329 is about 4611.6514395605. The cubic root of 21267329 is about 277.0581839398.

The spelling of 21267329 in words is "twenty-one million, two hundred sixty-seven thousand, three hundred twenty-nine".