21171014 has 16 divisors (see below), whose sum is σ = 32269536. Its totient is φ = 10416000.

The previous prime is 21170987. The next prime is 21171023. The reversal of 21171014 is 41017112.

It is a junction number, because it is equal to n+sod(n) for n = 21170983 and 21171001.

It is a congruent 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, 62654 + ... + 62990.

It is an arithmetic number, because the mean of its divisors is an integer number (2016846).

Almost surely, 2^21171014 is an apocalyptic number.

21171014 is a deficient number, since it is larger than the sum of its proper divisors (11098522).

21171014 is a wasteful number, since it uses less digits than its factorization.

21171014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 21171014 is about 4601.1970181682. The cubic root of 21171014 is about 276.6393060151.

Adding to 21171014 its reverse (41017112), we get a palindrome (62188126).

The spelling of 21171014 in words is "twenty-one million, one hundred seventy-one thousand, fourteen".