221021112001109 has 16 divisors (see below), whose sum is σ = 252903638257920. Its totient is φ = 189215612288640.

The previous prime is 221021112001037. The next prime is 221021112001153. The reversal of 221021112001109 is 901100211120122.

It is a happy number.

It is not a de Polignac number, because 221021112001109 - 2²⁴ = 221021095223893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021112001159) 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 15 ways as a sum of consecutive naturals, for example, 528055304 + ... + 528473694.

It is an arithmetic number, because the mean of its divisors is an integer number (15806477391120).

Almost surely, 2^{221021112001109} is an apocalyptic number.

It is an amenable number.

221021112001109 is a deficient number, since it is larger than the sum of its proper divisors (31882526256811).

221021112001109 is an equidigital number, since it uses as much as digits as its factorization.

221021112001109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510260.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 221021112001109 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twelve million, one thousand, one hundred nine".