21464505 has 12 divisors (see below), whose sum is σ = 37205220. Its totient is φ = 11447712.

The previous prime is 21464503. The next prime is 21464539. The reversal of 21464505 is 50546412.

21464505 is a `hidden beast` number, since 2 + 14 + 645 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 12873744 = 2931^2 + 3588^2 .

It is not a de Polignac number, because 21464505 - 2¹ = 21464503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21464501) 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 11 ways as a sum of consecutive naturals, for example, 238450 + ... + 238539.

It is an arithmetic number, because the mean of its divisors is an integer number (3100435).

Almost surely, 2^21464505 is an apocalyptic number.

It is an amenable number.

21464505 is a deficient number, since it is larger than the sum of its proper divisors (15740715).

21464505 is a wasteful number, since it uses less digits than its factorization.

21464505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477000 (or 476997 counting only the distinct ones).

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

The square root of 21464505 is about 4632.9801424137. The cubic root of 21464505 is about 277.9117821290.

The spelling of 21464505 in words is "twenty-one million, four hundred sixty-four thousand, five hundred five".