21169127 has 6 divisors (see below), whose sum is σ = 24625368. Its totient is φ = 18144924.

The previous prime is 21169121. The next prime is 21169139. The reversal of 21169127 is 72196112.

It is not a de Polignac number, because 21169127 - 2⁸ = 21168871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21169127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215963 + ... + 216060.

It is an arithmetic number, because the mean of its divisors is an integer number (4104228).

Almost surely, 2^21169127 is an apocalyptic number.

21169127 is a deficient number, since it is larger than the sum of its proper divisors (3456241).

21169127 is an equidigital number, since it uses as much as digits as its factorization.

21169127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432037 (or 432030 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 21169127 is about 4600.9919582629. The cubic root of 21169127 is about 276.6310866973.

The spelling of 21169127 in words is "twenty-one million, one hundred sixty-nine thousand, one hundred twenty-seven".