221021022009 has 16 divisors (see below), whose sum is σ = 299006753792. Its totient is φ = 145195037568.

The previous prime is 221021022007. The next prime is 221021022031. The reversal of 221021022009 is 900220120122.

It is a happy number.

It is not a de Polignac number, because 221021022009 - 2¹ = 221021022007 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221021022007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226174 + ... + 702279.

It is an arithmetic number, because the mean of its divisors is an integer number (18687922112).

Almost surely, 2^221021022009 is an apocalyptic number.

It is an amenable number.

221021022009 is a deficient number, since it is larger than the sum of its proper divisors (77985731783).

221021022009 is a wasteful number, since it uses less digits than its factorization.

221021022009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929616.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 221021022009 in words is "two hundred twenty-one billion, twenty-one million, twenty-two thousand, nine".