221211020009 has 16 divisors (see below), whose sum is σ = 258226790400. Its totient is φ = 185549899344.

The previous prime is 221211019979. The next prime is 221211020011. The reversal of 221211020009 is 900020112122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221211020009 - 2¹⁶ = 221210954473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211020059) 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 in 15 ways as a sum of consecutive naturals, for example, 2603012 + ... + 2686650.

It is an arithmetic number, because the mean of its divisors is an integer number (16139174400).

Almost surely, 2^221211020009 is an apocalyptic number.

It is an amenable number.

221211020009 is a deficient number, since it is larger than the sum of its proper divisors (37015770391).

221211020009 is an equidigital number, since it uses as much as digits as its factorization.

221211020009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91732.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 221211020009 in words is "two hundred twenty-one billion, two hundred eleven million, twenty thousand, nine".