221620027 has 2 divisors, whose sum is σ = 221620028. Its totient is φ = 221620026.

The previous prime is 221620013. The next prime is 221620033. The reversal of 221620027 is 720026122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221620027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221620097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110810013 + 110810014.

It is an arithmetic number, because the mean of its divisors is an integer number (110810014).

Almost surely, 2^221620027 is an apocalyptic number.

221620027 is a deficient number, since it is larger than the sum of its proper divisors (1).

221620027 is an equidigital number, since it uses as much as digits as its factorization.

221620027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221620027 is about 14886.9079059421. The cubic root of 221620027 is about 605.1592386432.

Adding to 221620027 its reverse (720026122), we get a palindrome (941646149).

The spelling of 221620027 in words is "two hundred twenty-one million, six hundred twenty thousand, twenty-seven".