221100312232201 has 4 divisors (see below), whose sum is σ = 221733837482500. Its totient is φ = 220466786981904.

The previous prime is 221100312232187. The next prime is 221100312232211. The reversal of 221100312232201 is 102232213001122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193368492490000 + 27731819742201 = 13905700^2 + 5266101^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100312232201 - 2¹¹ = 221100312230153 is a prime.

It is a super-2 number, since 2×221100312232201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100312232211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316762624626 + ... + 316762625323.

It is an arithmetic number, because the mean of its divisors is an integer number (55433459370625).

Almost surely, 2^{221100312232201} is an apocalyptic number.

It is an amenable number.

221100312232201 is a deficient number, since it is larger than the sum of its proper divisors (633525250299).

221100312232201 is an equidigital number, since it uses as much as digits as its factorization.

221100312232201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633525250298.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 221100312232201 its reverse (102232213001122), we get a palindrome (323332525233323).

The spelling of 221100312232201 in words is "two hundred twenty-one trillion, one hundred billion, three hundred twelve million, two hundred thirty-two thousand, two hundred one".