21470329 has 4 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 21167860.

The previous prime is 21470327. The next prime is 21470333. The reversal of 21470329 is 92307412.

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 21470329 - 2¹ = 21470327 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 = 21470297 and 21470306.

It is not an unprimeable number, because it can be changed into a prime (21470327) 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, 151129 + ... + 151270.

It is an arithmetic number, because the mean of its divisors is an integer number (5443200).

Almost surely, 2^21470329 is an apocalyptic number.

It is an amenable number.

21470329 is a deficient number, since it is larger than the sum of its proper divisors (302471).

21470329 is an equidigital number, since it uses as much as digits as its factorization.

21470329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302470.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21470329 is about 4633.6086369049. The cubic root of 21470329 is about 277.9369152787.

The spelling of 21470329 in words is "twenty-one million, four hundred seventy thousand, three hundred twenty-nine".