21170127 has 8 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 12830360.

The previous prime is 21170119. The next prime is 21170131. The reversal of 21170127 is 72107112.

It is a happy number.

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 21170127 - 2³ = 21170119 is a prime.

It is a super-2 number, since 2×21170127² = 896348554392258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170137) by changing a digit.

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, 320727 + ... + 320792.

It is an arithmetic number, because the mean of its divisors is an integer number (3849120).

Almost surely, 2^21170127 is an apocalyptic number.

21170127 is a deficient number, since it is larger than the sum of its proper divisors (9622833).

21170127 is a wasteful number, since it uses less digits than its factorization.

21170127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641533.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 21170127 is about 4601.1006291973. The cubic root of 21170127 is about 276.6354425174.

Adding to 21170127 its reverse (72107112), we get a palindrome (93277239).

The spelling of 21170127 in words is "twenty-one million, one hundred seventy thousand, one hundred twenty-seven".