221200102001001 has 4 divisors (see below), whose sum is σ = 294933469334672. Its totient is φ = 147466734667332.

The previous prime is 221200102000993. The next prime is 221200102001003. The reversal of 221200102001001 is 100100201002122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221200102001001 - 2³ = 221200102000993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200102001003) 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, 36866683666831 + ... + 36866683666836.

It is an arithmetic number, because the mean of its divisors is an integer number (73733367333668).

Almost surely, 2^{221200102001001} is an apocalyptic number.

It is an amenable number.

221200102001001 is a deficient number, since it is larger than the sum of its proper divisors (73733367333671).

221200102001001 is an equidigital number, since it uses as much as digits as its factorization.

221200102001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73733367333670.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221200102001001 its reverse (100100201002122), we get a palindrome (321300303003123).

It can be divided in two parts, 221200 and 102001001, that added together give a palindrome (102222201).

The spelling of 221200102001001 in words is "two hundred twenty-one trillion, two hundred billion, one hundred two million, one thousand, one".