21476705 has 8 divisors (see below), whose sum is σ = 25816104. Its totient is φ = 17152000.

The previous prime is 21476699. The next prime is 21476723. The reversal of 21476705 is 50767412.

It can be written as a sum of positive squares in 4 ways, for example, as 5058001 + 16418704 = 2249^2 + 4052^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21476705 - 2⁸ = 21476449 is a prime.

It is a super-2 number, since 2×21476705² = 922497715314050, which contains 22 as substring.

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

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 146 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (3227013).

Almost surely, 2^21476705 is an apocalyptic number.

It is an amenable number.

21476705 is a deficient number, since it is larger than the sum of its proper divisors (4339399).

21476705 is an equidigital number, since it uses as much as digits as its factorization.

21476705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21476705 is about 4634.2966025061. The cubic root of 21476705 is about 277.9644253428.

The spelling of 21476705 in words is "twenty-one million, four hundred seventy-six thousand, seven hundred five".