21161327 has 18 divisors (see below), whose sum is σ = 24150672. Its totient is φ = 18519600.

The previous prime is 21161323. The next prime is 21161377. The reversal of 21161327 is 72316112.

It is not a de Polignac number, because 21161327 - 2² = 21161323 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 346877 + ... + 346937.

It is an arithmetic number, because the mean of its divisors is an integer number (1341704).

Almost surely, 2^21161327 is an apocalyptic number.

21161327 is a deficient number, since it is larger than the sum of its proper divisors (2989345).

21161327 is an equidigital number, since it uses as much as digits as its factorization.

21161327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 119 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 21161327 is about 4600.1442368691. The cubic root of 21161327 is about 276.5971065912.

Adding to 21161327 its reverse (72316112), we get a palindrome (93477439).

It can be divided in two parts, 2116 and 1327, that added together give a palindrome (3443).

The spelling of 21161327 in words is "twenty-one million, one hundred sixty-one thousand, three hundred twenty-seven".