221200100001001 has 16 divisors (see below), whose sum is σ = 242800567051968. Its totient is φ = 199848305332800.

The previous prime is 221200100000987. The next prime is 221200100001103. The reversal of 221200100001001 is 100100001002122.

It is a cyclic number.

It is not a de Polignac number, because 221200100001001 - 2¹¹ = 221200099998953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200100008001) 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, 37173691 + ... + 42711631.

It is an arithmetic number, because the mean of its divisors is an integer number (15175035440748).

Almost surely, 2^{221200100001001} is an apocalyptic number.

It is an amenable number.

221200100001001 is a deficient number, since it is larger than the sum of its proper divisors (21600467050967).

221200100001001 is a wasteful number, since it uses less digits than its factorization.

221200100001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560392.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221200100001001 its reverse (100100001002122), we get a palindrome (321300101003123).

The spelling of 221200100001001 in words is "two hundred twenty-one trillion, two hundred billion, one hundred million, one thousand, one".