21464604 has 72 divisors (see below), whose sum is σ = 65287040. Its totient is φ = 5808672.

The previous prime is 21464603. The next prime is 21464627. The reversal of 21464604 is 40646412.

21464604 is a `hidden beast` number, since 2 + 14 + 646 + 0 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464603) 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, 2547 + ... + 7029.

Almost surely, 2^21464604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21464604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32643520).

21464604 is an abundant number, since it is smaller than the sum of its proper divisors (43822436).

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

21464604 is a wasteful number, since it uses less digits than its factorization.

21464604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519 (or 4514 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 21464604 is about 4632.9908266691. The cubic root of 21464604 is about 277.9122093960.

The spelling of 21464604 in words is "twenty-one million, four hundred sixty-four thousand, six hundred four".