21272183 has 2 divisors, whose sum is σ = 21272184. Its totient is φ = 21272182.

The previous prime is 21272179. The next prime is 21272189. The reversal of 21272183 is 38127212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21272183 - 2² = 21272179 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_1346057 and since 21272183 and 1346057 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21272189) 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 as a sum of consecutive naturals, namely, 10636091 + 10636092.

It is an arithmetic number, because the mean of its divisors is an integer number (10636092).

Almost surely, 2^21272183 is an apocalyptic number.

21272183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21272183 is an equidigital number, since it uses as much as digits as its factorization.

21272183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 21272183 is about 4612.1776852155. The cubic root of 21272183 is about 277.0792606835.

Adding to 21272183 its reverse (38127212), we get a palindrome (59399395).

The spelling of 21272183 in words is "twenty-one million, two hundred seventy-two thousand, one hundred eighty-three".