21414505 has 16 divisors (see below), whose sum is σ = 30086784. Its totient is φ = 14325120.

The previous prime is 21414461. The next prime is 21414529. The reversal of 21414505 is 50541412.

It is not a de Polignac number, because 21414505 - 2⁷ = 21414377 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6027 + ... + 8896.

It is an arithmetic number, because the mean of its divisors is an integer number (1880424).

Almost surely, 2^21414505 is an apocalyptic number.

It is an amenable number.

21414505 is a deficient number, since it is larger than the sum of its proper divisors (8672279).

21414505 is a wasteful number, since it uses less digits than its factorization.

21414505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14976.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21414505 is about 4627.5809015078. The cubic root of 21414505 is about 277.6958226076.

Adding to 21414505 its reverse (50541412), we get a palindrome (71955917).

The spelling of 21414505 in words is "twenty-one million, four hundred fourteen thousand, five hundred five".