1620221011 has 2 divisors, whose sum is σ = 1620221012. Its totient is φ = 1620221010.

The previous prime is 1620220999. The next prime is 1620221027. The reversal of 1620221011 is 1101220261.

It is an a-pointer prime, because the next prime (1620221027) can be obtained adding 1620221011 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (1101220261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620221011 - 2¹³ = 1620212819 is a prime.

It is a super-2 number, since 2×1620221011² = 5250232248971724242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1620221041) 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, 810110505 + 810110506.

It is an arithmetic number, because the mean of its divisors is an integer number (810110506).

Almost surely, 2^1620221011 is an apocalyptic number.

1620221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620221011 is an equidigital number, since it uses as much as digits as its factorization.

1620221011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1620221011 is about 40251.9690325827. The cubic root of 1620221011 is about 1174.5136991080.

Adding to 1620221011 its reverse (1101220261), we get a palindrome (2721441272).

The spelling of 1620221011 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, eleven".