21470330 has 48 divisors (see below), whose sum is σ = 46046880. Its totient is φ = 7183008.

The previous prime is 21470327. The next prime is 21470333. The reversal of 21470330 is 3307412.

It is an interprime number because it is at equal distance from previous prime (21470327) and next prime (21470333).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20561 + ... + 21579.

It is an arithmetic number, because the mean of its divisors is an integer number (959310).

Almost surely, 2^21470330 is an apocalyptic number.

21470330 is an abundant number, since it is smaller than the sum of its proper divisors (24576550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21470330 is a wasteful number, since it uses less digits than its factorization.

21470330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21470330 is about 4633.6087448122. The cubic root of 21470330 is about 277.9369195938.

Adding to 21470330 its reverse (3307412), we get a palindrome (24777742).

The spelling of 21470330 in words is "twenty-one million, four hundred seventy thousand, three hundred thirty".