1620221027 has 2 divisors, whose sum is σ = 1620221028. Its totient is φ = 1620221026.

The previous prime is 1620221011. The next prime is 1620221041. The reversal of 1620221027 is 7201220261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620221027 - 2⁴ = 1620221011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620220993 and 1620221011.

It is not a weakly prime, because it can be changed into another prime (1620223027) 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, 810110513 + 810110514.

It is an arithmetic number, because the mean of its divisors is an integer number (810110514).

Almost surely, 2^1620221027 is an apocalyptic number.

1620221027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620221027 is an equidigital number, since it uses as much as digits as its factorization.

1620221027 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 23.

The square root of 1620221027 is about 40251.9692313308. The cubic root of 1620221027 is about 1174.5137029742.

Adding to 1620221027 its reverse (7201220261), we get a palindrome (8821441288).

The spelling of 1620221027 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, twenty-seven".