21471017 has 8 divisors (see below), whose sum is σ = 22937256. Its totient is φ = 20027392.

The previous prime is 21470987. The next prime is 21471019. The reversal of 21471017 is 71017412.

It can be written as a sum of positive squares in 4 ways, for example, as 3671056 + 17799961 = 1916^2 + 4219^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21471017 is a prime.

It is a super-2 number, since 2×21471017² = 922009142028578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21470983 and 21471001.

It is not an unprimeable number, because it can be changed into a prime (21471019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3668 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (2867157).

Almost surely, 2^21471017 is an apocalyptic number.

It is an amenable number.

21471017 is a deficient number, since it is larger than the sum of its proper divisors (1466239).

21471017 is a wasteful number, since it uses less digits than its factorization.

21471017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11307.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 21471017 is about 4633.6828765033. The cubic root of 21471017 is about 277.9398840044.

Adding to 21471017 its reverse (71017412), we get a palindrome (92488429).

The spelling of 21471017 in words is "twenty-one million, four hundred seventy-one thousand, seventeen".