21474530 has 48 divisors (see below), whose sum is σ = 48482496. Its totient is φ = 6653280.

The previous prime is 21474521. The next prime is 21474533. The reversal of 21474530 is 3547412.

It is a super-2 number, since 2×21474530² = 922310877441800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21474530.

It is not an unprimeable number, because it can be changed into a prime (21474533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128507 + ... + 128673.

It is an arithmetic number, because the mean of its divisors is an integer number (1010052).

Almost surely, 2^21474530 is an apocalyptic number.

21474530 is an abundant number, since it is smaller than the sum of its proper divisors (27007966).

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

21474530 is a wasteful number, since it uses less digits than its factorization.

21474530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21474530 is about 4634.0619331209. The cubic root of 21474530 is about 277.9550416402.

The spelling of 21474530 in words is "twenty-one million, four hundred seventy-four thousand, five hundred thirty".