1621220327 has 2 divisors, whose sum is σ = 1621220328. Its totient is φ = 1621220326.

The previous prime is 1621220311. The next prime is 1621220347. The reversal of 1621220327 is 7230221261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621220327 - 2⁴ = 1621220311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621220296 and 1621220305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621220347) 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, 810610163 + 810610164.

It is an arithmetic number, because the mean of its divisors is an integer number (810610164).

Almost surely, 2^1621220327 is an apocalyptic number.

1621220327 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621220327 is an equidigital number, since it uses as much as digits as its factorization.

1621220327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1621220327 is about 40264.3803752150. The cubic root of 1621220327 is about 1174.7551207207.

Adding to 1621220327 its reverse (7230221261), we get a palindrome (8851441588).

The spelling of 1621220327 in words is "one billion, six hundred twenty-one million, two hundred twenty thousand, three hundred twenty-seven".