21464550 has 36 divisors (see below), whose sum is σ = 57669300. Its totient is φ = 5723760.

The previous prime is 21464549. The next prime is 21464561. The reversal of 21464550 is 5546412.

21464550 is a `hidden beast` number, since 2 + 14 + 645 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 23400 + ... + 24299.

It is an arithmetic number, because the mean of its divisors is an integer number (1601925).

Almost surely, 2^21464550 is an apocalyptic number.

21464550 is an abundant number, since it is smaller than the sum of its proper divisors (36204750).

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

21464550 is a wasteful number, since it uses less digits than its factorization.

21464550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47717 (or 47709 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 21464550 is about 4632.9849988965. The cubic root of 21464550 is about 277.9119763414.

The spelling of 21464550 in words is "twenty-one million, four hundred sixty-four thousand, five hundred fifty".