221001321001211 has 4 divisors (see below), whose sum is σ = 221067827571192. Its totient is φ = 220934814431232.

The previous prime is 221001321001177. The next prime is 221001321001277. The reversal of 221001321001211 is 112100123100122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221001321001211 - 2⁴² = 216603274490107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221001321001211.

It is not an unprimeable number, because it can be changed into a prime (221001321007211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33253280006 + ... + 33253286651.

It is an arithmetic number, because the mean of its divisors is an integer number (55266956892798).

Almost surely, 2^{221001321001211} is an apocalyptic number.

221001321001211 is a deficient number, since it is larger than the sum of its proper divisors (66506569981).

221001321001211 is an equidigital number, since it uses as much as digits as its factorization.

221001321001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66506569980.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221001321001211 its reverse (112100123100122), we get a palindrome (333101444101333).

The spelling of 221001321001211 in words is "two hundred twenty-one trillion, one billion, three hundred twenty-one million, one thousand, two hundred eleven".