221331211001 has 4 divisors (see below), whose sum is σ = 221335277904. Its totient is φ = 221327144100.

The previous prime is 221331210953. The next prime is 221331211009. The reversal of 221331211001 is 100112133122.

221331211001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221331211001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221331211009) 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, 1950695 + ... + 2061036.

It is an arithmetic number, because the mean of its divisors is an integer number (55333819476).

Almost surely, 2^221331211001 is an apocalyptic number.

It is an amenable number.

221331211001 is a deficient number, since it is larger than the sum of its proper divisors (4066903).

221331211001 is an equidigital number, since it uses as much as digits as its factorization.

221331211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066902.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221331211001 its reverse (100112133122), we get a palindrome (321443344123).

The spelling of 221331211001 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, one".