21459474 has 48 divisors (see below), whose sum is σ = 51835680. Its totient is φ = 6376320.

The previous prime is 21459463. The next prime is 21459479. The reversal of 21459474 is 47495412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21459479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3969 + ... + 7659.

It is an arithmetic number, because the mean of its divisors is an integer number (1079910).

Almost surely, 2^21459474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21459474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25917840).

21459474 is an abundant number, since it is smaller than the sum of its proper divisors (30376206).

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

21459474 is a wasteful number, since it uses less digits than its factorization.

21459474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735 (or 3732 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21459474 is about 4632.4371555370. The cubic root of 21459474 is about 277.8900674668.

The spelling of 21459474 in words is "twenty-one million, four hundred fifty-nine thousand, four hundred seventy-four".