221056621206009 has 24 divisors (see below), whose sum is σ = 317388843405600. Its totient is φ = 136802163608064.

The previous prime is 221056621205999. The next prime is 221056621206049. The reversal of 221056621206009 is 900602126650122.

It is not a de Polignac number, because 221056621206009 - 2²⁰ = 221056620157433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221056621206049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1746287859 + ... + 1746414440.

It is an arithmetic number, because the mean of its divisors is an integer number (13224535141900).

Almost surely, 2^{221056621206009} is an apocalyptic number.

It is an amenable number.

221056621206009 is a deficient number, since it is larger than the sum of its proper divisors (96332222199591).

221056621206009 is a wasteful number, since it uses less digits than its factorization.

221056621206009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492702409 (or 3492702392 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 221056621206009 in words is "two hundred twenty-one trillion, fifty-six billion, six hundred twenty-one million, two hundred six thousand, nine".