21471105 has 16 divisors (see below), whose sum is σ = 34531200. Its totient is φ = 11392128.

The previous prime is 21471097. The next prime is 21471133. The reversal of 21471105 is 50117412.

It is a happy number.

It is not a de Polignac number, because 21471105 - 2³ = 21471097 is a prime.

It is a super-2 number, since 2×21471105² = 922016699842050, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 612 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (2158200).

Almost surely, 2^21471105 is an apocalyptic number.

It is an amenable number.

21471105 is a deficient number, since it is larger than the sum of its proper divisors (13060095).

21471105 is a wasteful number, since it uses less digits than its factorization.

21471105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7400.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 21471105 is about 4633.6923721801. The cubic root of 21471105 is about 277.9402637206.

Adding to 21471105 its reverse (50117412), we get a palindrome (71588517).

The spelling of 21471105 in words is "twenty-one million, four hundred seventy-one thousand, one hundred five".