21470484 has 48 divisors (see below), whose sum is σ = 57552768. Its totient is φ = 6102528.

The previous prime is 21470483. The next prime is 21470489. The reversal of 21470484 is 48407412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19024 + ... + 20120.

It is an arithmetic number, because the mean of its divisors is an integer number (1199016).

Almost surely, 2^21470484 is an apocalyptic number.

It is an amenable number.

21470484 is an abundant number, since it is smaller than the sum of its proper divisors (36082284).

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

21470484 is a wasteful number, since it uses less digits than its factorization.

21470484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 21470484 is about 4633.6253624996. The cubic root of 21470484 is about 277.9375841105.

Adding to 21470484 its reverse (48407412), we get a palindrome (69877896).

The spelling of 21470484 in words is "twenty-one million, four hundred seventy thousand, four hundred eighty-four".