21470105 has 8 divisors (see below), whose sum is σ = 25805952. Its totient is φ = 17148208.

The previous prime is 21470081. The next prime is 21470123. The reversal of 21470105 is 50107412.

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

It is a cyclic number.

It is not a de Polignac number, because 21470105 - 2⁸ = 21469849 is a prime.

It is a super-2 number, since 2×21470105² = 921930817422050, 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (3225744).

Almost surely, 2^21470105 is an apocalyptic number.

It is an amenable number.

21470105 is a deficient number, since it is larger than the sum of its proper divisors (4335847).

21470105 is an equidigital number, since it uses as much as digits as its factorization.

21470105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6975.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21470105 is about 4633.5844656162. The cubic root of 21470105 is about 277.9359487031.

Adding to 21470105 its reverse (50107412), we get a palindrome (71577517).

The spelling of 21470105 in words is "twenty-one million, four hundred seventy thousand, one hundred five".